Excellent Quality: The bolt and nut Identifier gauge is crafted from CNC-machined anodized aluminum alloy and hardness SUS304 stainless steel thread, for maximum thread strength and ultimate precision. with a protective anodized finish laser etched markings wont fade or get scratched off. Laser Etched Dual Scale - Our bolt size and thread gauge features durable laser etched inch and centimeter sized edges, allowing for fast, accurate, and user-friendly identification of thread sizes. Wide-volume size detection-Our nuts and bolt thread detectors can immediately identify 28 different sizes, including the public thread size of x 0.7 to M14 x 2.0, and 6-32 fine to 1/2-20 fine English threaded threads Essence 28 SIZE Nut and Bolt Identification Tool Ruler With Inches And Centimeters On Both Sides Convenient and essential - very suitable for purposes, screw gauges can be effortlessly installed on walls or tool boxes. With its reserved installation holes, it is an essential tool for and DIY enthusiasts. Colour:red Material:Aluminum alloy Size: 50 x 10 x 2.5cm Package Contents: 1 x thread check 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.