Name: Eureka Crate Classics (5-Pack)
Brand: KiwiCo
SKU: EFIV
Price: 149.95 USD
Availability: OutOfStock
Rating: 5 (2 reviews)

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Engineer a lock box to keep your stuff safe! 
Build the lock, assemble a door that uses gears to keep things inside, and test it out with the included key. Discover how pin tumbler locks work, the history of unpickable locks, and even get inspired to make safes that can be hidden in plain sight.

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Eureka

Mechanical Lock Box

Mechanical Lockbox

This was by far the favorite Kiwi project! It took a little patience’s and following directions but they had so much fun making their lock “secret” box! I’m so glad I purchased one for each of the kids. They painted them when they finished building them. They are so proud of them! It was the summer highlight for sure!!! Highly recommend this project!!

This is very well engineered and I use it a lot in my daily lifestyle.

Learn how a pin tumbler lock works and create a safe for your stuff! Follow along in the Maker’s Guide for step-by-step instructions to build the lock, assemble the door, and attach the box. Explore the science, engineering, and history behind mechanical lock box design along the way.

Mechanical Lock Box | KiwiCo

Sharpen some pencils — and your engineering skills — with a pencil sharpener you build yourself! Construct the core, add the battery, and wire your mechanism up. Then learn about the invention of pencils, the evolution of sharpener design, and hidden engineering features that help your sharpener work smarter!

seamless (used in My Account orders)

Electric Pencil Sharpener

Pencil Sharpener

I was a bit concerned when I saw the age was for 14+. However, my 9 year old grandson loved making this sharpener with supervision. The instructions are very clear and easy to follow. A great gift for any curious child.

This is hands down the coolest project ever!! 

My grandson loved putting this together and then sharing it with his class at school. He is ten. 

Did not give any challenge to put together 

This is such an awesome and useful kit. But to be honest, the first kit didn’t turn on despite double and triple checking the connections. Kiwi was very quick to provide replacement motor/battery pack/wires (we reused the bulk of the original parts). It worked great the second time around. 

This was a little complicated, very cool and very practical. Perfect for my pre-teen!

The pencil sharpener was great.  I purchased  it for my 3 grandsons, ages 5 twins aged 8, whom are being home schooled by their Mother.  The 3 of them took turns assembling it.  There was something that they could all do together.  They were so proud at their accomplishment.  They are using it in their home school classroom.

Very engaging and well designed model. Worked in first attempt.

Awesome kit. It was easy for my mechanically inclined 11 year old. He absolutely loves that he could make something practical.

The Electric Pencil Sharpener was a great starter project for me and my son. The directions were very clear and it was a great hands on engineering project. 

Sharpen some pencils — and your engineering knowhow — with a pencil sharpener you built yourself!

Electric Pencil Sharpener | KiwiCo

Wire up a pair of headphones and jam to your favorite music! Build the headband, rig up the speaker drivers, and experiment with stereo sound. Explore how speakers and other electroacoustic transducers turn electricity into sound, then learn about the engineering history that made modern headsets possible.

Stereo Headphones

Headphones

The grandkids love this kit. It is something they can build and use!  

This one is great especially if your kids have a tablet. The only thing is the ear pads don’t have a good wear life since they just slip on so maybe some double sided tape to keep them on with constantly taking headphones on and off over time.

Wonderful activity. 12 yr old kiddo LOVED it. We were able to really talk about it and she taught me all about the mechanics and electrical! Great!

Our grandson absolutely loved building his headphones. And it's been a year and he still uses them daily! So it lasts, is well designed, and provides hours of fun plus his feeling of accomplishment: he tells his friends he made them! So proud!


This is easily the favorite kit my 12 year old has done! (Close second is the kinetic speaker) The build was challenging and the quality of the headphones is great. He uses them daily for homeschool lessons and they've held up really well.

My daughter LOVES being able to bring these headphones to school and say she made them. She always surprises her teachers when they actually work!

My daughter followed all the instructions perfectly. She loved the snarked about sacrificing a headphone set for her to create her own!

I was thinking of ending my subscription when my son turned 18, but this kit changed both of our minds! Now I’m ordering another kit for myself! Standard headphones are usually too tight. This is very comfortable, it’s cool looking, and the sound is impressive! 
We may never end our subscription! 
Way to go Kiwi employees!!! ?????Keep it up!!!

My 8yo loved this project. She has used them every day since she made them. My husband helped with the instructions but I think she would have figured it out alone too.

My grandson, who's 10, loved the headphones!

Build the headphone headband, rig up the speaker drivers, and experiment with stereo sound. Explore how speakers and other electroacoustic transducers turn electricity into sound, then learn about the historical technologies that made modern headsets possible.

Stereo Headphones | KiwiCo

Seize the day with this mechanical flip calendar that can be used year after year. 

Construct the date and day-of-the-week tumblers, add the month dial, then put them all together using a marvelous mechanism called a Geneva drive. Explore the evolution of perpetual calendar design, then read about some kooky calendar calamities through the ages (from skipped leap years to the Y2K bug)! 

This item is excluded from Store discounts or promotions.

Perpetual Calendar

Like usual, it was FUN to build and useful!  I have it set up in my learning room and change the day & date each day :) It came at the perfect time, I was learning about the Mayan calendar in my history lesson!

Creative idea, easy to assemble, something he will use

So creative

It was complicated but still fun to put together.

Fun to build

Great item that can be used all year round and looks great on display

Looks great

Very good quality materials! Impressive!!

Impressive!

My daughter really loved this one; she’s excited to use it every day

Daily use for her

I enjoy the mechanics and its useability once it’s been constructed.

Fun and functional

Practical, something I can use daily after I put it together!

So useful!

The mechanisms for switching day and date were interesting to figure out

Interesting to learn

Seize the day with this mechanical flip calendar that can be used year after year. Construct the date and day-of-the-week tumblers, add the month dial, then put them all together using a marvelous mechanism called a Geneva drive. Explore the evolution of perpetual calendar design, then read about some kooky calendar calamities through the ages (from skipped leap years to the Y2K bug)!

Perpetual Calendar | KiwiCo

Make some music with a four-string ukulele you build yourself!
Build your frets and neck before connecting them to the wooden body. Explore the science of vibration and sound waves as you learn how to string and tune your ukulele. Strum a few cords, then rock out to some beginner-friendly songs.

Ukulele

My 11 year old received this as a gift. She disappeared into her room and returned an hour later with the ukulele. She said the knot tying slowed her down but she enjoyed the build. She likes these Kiwi crates but I wish they were more challenging. This was probably the longest she’s spent time-wise on what she’s received over the past 4-5 months. 

Daughter throughly enjoyed this one!  She even took it to the next level and painted her favorite character, Stitch, on it.  We def recommend this project!  Kids look forward to these coming in the mail.  They share a eureka subscription so they trade off every other month.

These crates go to my grandkids and I rarely hear about them but this one was such a hit that I had to order another one for little sister.

The Ukulele was well designed and sturdy, and it even stayed in tune after the strings stretched properly. The instructions were good too. A good price for a well designed kit. Adam Savage's YouTube review guided us to the kiwoco ukulele.

I subscribe to three lines - two for my kids, and this one for me - and this is my favorite one that I've gotten so far.

This was a lot of fun for my son to put together and it has a surprisingly good sound for what it is. 

The Ukulele kit looks great and it arrived within the time quoted. My only issue was the state of the box 

Amazing crate, if you have any problems with the strings buzzing, (in my case it was the E string) I found that you can move a string out of the nut and into the slot of another string to fix it

Love this although it took 2 of us to put it together which was a great team effort and a fun project to do with my husband. It is hard to tune correctly unless we are doing something wrong but overall we enjoy it and so do our little ones as they like the sounds of strumming the strings. 

Count me among the adults who buys your KiwiCrates, "for his kids." We do build them together but this was the first kit I purchased exclusively for myself as a builder and ukulele player. The sound doesn't compare to a real uke, but it is the only ukulele I own THAT I BUILT WITH MY OWN BARE HANDS. It is impressive that laser cut plywood holds the strain of those strings without any glue. Impressive engineering. I've wanted to build my own out of solid wood and this kit gave me the ideas and confidence to try!

I need to reinvestigate the manual to make sure I didn't miss it in the lovely extended learning sections, because one of the things I was hoping to learn was the math behind the spacing of the frets. 

Thanks KiwiCo!

The ukulele was so much fun to make and it sounds and looks amazing!

Make some music with a four-string ukulele you build yourself!

Ukulele | KiwiCo

Create your own STEM-powered adventure at home, with this 5-pack bundle of some of our most popular Eureka crates. There's something here for every budding scientist, engineer, or innovator — from hands-on projects to amazing articles. 
All 5 projects delivered together. 
1. Headphones 
Build the headphone headband, rig up the speaker drivers, and experiment with stereo sound. 
2. Pencil Sharpener 
Sharpen some pencils — and your engineering knowhow — with a pencil sharpener you built yourself! 
3. Mechanical Lockbox 
Build the lock mechanism, construct the box, and enjoy having a place to keep precious items safe and sound. 
4. Ukulele 
Make some music (and some engineering memories) with a four-string ukulele you build yourself! 
5. Perpetual Calendar 
Seize the day with this mechanical flip calendar that can be used year after year.

Eureka Crate Classics (5-Pack)

Great quality and instructions.  My girls loved it!

Excellent!

My son and I have searched for activities during the Covid-19 Pandemic and distance learning.  The KiwiCo kits are amazing.  My son, who is 10 years old, could put the projects together himself and felt great satisfaction when he was done.  We will definitely be purchasing more of these amazing sets.  The sets we put together were the electric soap dispenser, stamping machine, headphones, and pinball machine.  I think that the pinball machine was the favorite because he loves to play with it each day.

Wonderful addition to Distance Learning

Create your own STEAM-powered adventure at home with this 5-pack bundle of some of our most popular Eureka crates.. There's something here for every budding scientist, engineer, or innovator — from hands-on projects to amazing articles.