1、5PCS FILES: Woodworking rotary file set, including 5 different specifications and shapes to meet different grinding and carving needs. 2、DOUBLE CUT: These rotary files are double cut design, which can produce a finer finish and reduce the size of chips, and easy to control. 3、1/4IN SHANK: These files have standard 1/4in round shank, can be installed on a hand drill or electric grinder, compatible with most power tools. 4、EXCELLENT METAL: The rotary file is made of tungsten steel alloy, with high hardness, abrasion resistance, strong penetration, and no bending. 5、APPLICABLE RANGE: Suitable for grinding solid wood board, multilayer board, MDF board, density board, particle board, interlayer board, plastic, etc.