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- Feature
- ✅ Quick measure various types of screws, nuts, bolts, and threads
- ✅ Accurate size identification, make them easy to store
- ✅ Easy to read and operate with clear markings
- ✅ Allumiumn alloy and stainless steel material for durable use
- ✅ Hanging on the wall or flat placing

Free Shipping & Free Tax
In Stock + Dispatch within 48-72 hours.Expect it in 5-8 working days. We have warehouses in the United States, Australia and other countries, we will ship from the nearest warehouse according to your address.
30-Day Money-Back Guarantee
We’re so confident that you’ll like and use the iToolMax forever that we offer a 30-Day Money-back Guarantee on all orders. if the product arrives damaged or out of shape, feel free to contact us within 30 days of arrival & receive a full refund,No hassle. You are protected by our guarantee. E-mail us and we’ll refund your payment soon.


Your Go-to Tool for Nut & Bolt Identifying! 📏
Quickly identify confusing bolt and nut sizes with our Nut and Bolt Thread Checker, classify them neatly and store them for easy repair and maintenance work! Suitable for craftsman, engineers, and DIY enthusiast or hobbyist.

Precise Measurement
Simplify your projects by quickly verifying thread pitches, bolt sizes, and more with ease. Compact, durable, and easy to use, this thread checker is a must-have for workshops, garages, and toolboxes.

28/44 Holes Options
28 Holes: M4 x 0.7 to M14 x 2.0 metric threads and 6 - 32 coarse threads to 1/2 - 20 fine standard threads sizes.
44 Holes: M3 x 0.5 to M24 x 3.0 metric threads and 6-32 coarse to 1-12 fine standard threads sizes.

Aluminum Alloy & Steel Material
Made of CNC machined anodized aluminum alloy 6061 and SUS304 stainless steel, meet Go & No Go Class 2B ANSI standards for both internal and external threads. With a protective anodized finish, the laser etched markings will not fade or scratch off.