28-Size Versatility: Our nut and bolt thread checker instantly identify 28 distinct sizes(standard and metric thread size checker), with metric threads ranging from M4 x 0.7 to M14 x 2.0 and standard threads sizes from #6 - 32 coarse to 1/2 - 20 fine, catering to a broad spectrum of standard hardware. Dual Scales for Ultimate Convenience: Equipped with laser-etched inch and centimeter scales, 's nut and bolt thread checker enables quick, user-friendly identification. The double-sided gauge ensures accuracy and ease of comparison. Robust and Portable Design: The lightweight Metal structure ensure portability without compromising on quality.With pre-drilled 3 mounting holes, this essential tool can be easily attached to walls or toolboxes, making it a readily accessible asset in any workspace. User Safety Consideration: Emphasizing user safety, the reminds users to don work gloves to prevent injuries during operation. Workshop and DIYer's companion: Not just a tool but a workshop essential, Whether you're a seasoned mechanic or a passionate DIYer, thread checker equips you to measure, identify, and work with confidence. Colour:blue Material:Metal Package Contents: 1 x Thread Checker 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.