Clearly Marked, Easy to Read: Size markings are clearly engraved for immediate identification of thread size, minimizing errors, making it a reliable tool for and DIY enthusiasts Multiple Unit Readings: This includes both metric and imperial units, providing flexibility and convenience for precise measurements on any project Rugged and : Made of high-quality, - materials, this thread size checker can withstand frequent use and harsh conditions, providing reliable long-term performance There are slight differences in appearance between batches, and the color of the bolts may be random, don't accept the specified, which does not affect the applicability Colour:Silver Material:Zinc Alloy Package Contents: 2 x Thread Size Checker Keychain Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.