Easy to identify: 38 nuts and bolt recognition tool ruler can easily distinguish between public and British thread size, and verify the size and thread distance of the standard hardware, so you no longer need to worry about the size of the existing fastener Strong durability: the bolt thread quantity is made of High-quality materials. It is solid and , has persistent strength and design; laser printing is also easy to read, but it is not easy to fade or is scratched by scratching. Splitted 2 -piece design: Naruts and bolt threads are designed for split type 2 types, which are suitable for hanging or on the working ; the minimum size is only the size of the palm, which is suitable for carrying and using it. Inch and centimeter rules: 17 public sizes: M3X0.5, M4X0.7, M5X0.8, M6x1.0, M7x1.0, M8x1.25, M10X1.0, M10X1.25, M12X1.25, M12x0.25, M12x1, M12x1 .5, M12X1.75, M14x1.5, M14x2.0, M16x1.5, M16x2.0. 21-inch size: 2-56, 4-40, 6-32, 8-32, 10-24, 10-32 , 12-24, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 3/8-22, 7/16 16 -14, 7/16-20, 1/2-13, 1/2-20, 9/16-12, 9/16-18, 5/8-18 (numbers are white, permanently printed on aluminum alloy, The handwriting is clear and does not fade) Easy to suspend: the screw quantity standards and the public system have 2 pre -drilling holes, which is convenient for suspension and fixing in a toolkit; this convenient function saves time and energy , so that you can focus on your project for your project. Material: Metal colour: blue Package Contents: 1 x contour gauge tool 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.