Made of plastic, so you can use it easily. [Use] Exterior/Interior/Step/Depth Measurement Features: The scale is a step scale that is easy to see the scale in 0.04 inch (1 mm) increments. Comes with 0.04 inch (1 mm) reading bar that is convenient when fine numbers are not needed. ・Comes with a plain white shackle that can be customized according to the application. Comes with a magnet and strap hole for convenient storage and portability. ASIN B00CR982KC Model PC-70KD Range 70 millimeters Brand Name 新潟精機(Niigataseiki) Unit Count 1.00 Count Item Weight 9.07 g Part Number PC-70KD Manufacturer Niigata seiki Co.,Ltd. Material Type Plastic Measurement Accuracy +/-0.01 inches