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Gears! Gears! Gears!® Mega Builds
Gears! Gears! Gears!® Mega Builds
Gears! Gears! Gears!® Mega Builds
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Gears! Gears! Gears!® Mega Builds

Marsoni M251S
Sale price$384.50
Pay 4 payments of $96.12 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Gears! Gears! Gears!® Mega BuildsBring your machine dreams to life with our biggest Gears! building set yet! Engineer twisting, turning creations with this 225 piece STEM building sets colorful moving gears, then add to the fun with accessories including wheels and propellers. Works with all Gears! sets. Perfect for classrooms and maker spaces!
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Quick Dispatch:

Your Gears! Gears! Gears!® Mega Builds orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Gears! Gears! Gears!® Mega Builds ships.

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 894 reviews
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Product Reviews
W
Verified Purchase
whodg
Omaha, US
★★★★★ 5
Awesome tool
Very easy to use, only issue I had was the location pin was a bit tight. Chucked it in the drill and polished it up with a scotch-brite and it worked perfectly. The end to end symmetry made it easy to move from one side to the other. Good price as well!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 24, 2024
R
Verified Purchase
Road Warrior Ray
Birmingham, US
★★★★★ 4
Excellent 11 hole jig
Size: 11 Holes
This jig worked excellently. It doesn't have any instructions, so I watched the video of it. I set it up the way the video showed, and I got decent results. Deducted a star since no instructions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 18, 2026
J
Verified Purchase
Janis E White
Charlottesville, US
★★★★★ 5
Perfect hole placement
Size: 11 Holes
Worked exactly as described.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 24, 2025
J
Verified Purchase
Jeffrey A Bradley
Bozeman, US
★★★★★ 5
Good jig
Size: 11 Holes
The jig itself is great. The markings make it easy to be consistent; the design is well thought-out; and the build quality is good. I would recommend replacing the drill bit, though. A nice brad point will serve you better.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025
W
Verified Purchase
WhiteTiger96
Bozeman, US
★★★★★ 5
Great
Size: 11 Holes
Worked better than expected
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 10, 2026

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