[6PCS DEBURRING TOOLS] Universal Size - 6mm (1/4") Handle, Handle Length: 30mm, File Length: 25mm, Cutting Edge Diameter: 5pcs-12.7mm and 1pcs-6mm.Includes 6 Popular Shapes: Domed Cylinder, Round Shaft, Ball End Concave Arc, Inverted Cone, Cylinder, Cone.Different shapes are used in different working scenarios, designed for professionals and DIY users. [HIGH QUALITY] High quality steel, made with full grinding process, more durable than traditional milling products, sharp and wear-resistant. High efficiency, high finish, good economic efficiency, sturdy and durable knife body, long service life. The processing hardness reaches hra85. [DURABLE AND RELIABLE] The double chamber is a cross line, not easy to clog the line, better suited for materials with relatively low density. Single-blade file drills are suitable for materials such as iron, copper and wood. For carving resin, plastic, porcelain, soft metal, stone, etc.; Suitable for grinding, polishing wood, jade, etc. [STRONG COMPATIBILITY] Compatible with all electric and cordless drills, pneumatic tools, mold grinders and other rotary tools. It can also be used in drills, lathes, manual or flexible electric or pneumatic equipment. For grinding various metals (including various hardened steels) and non-metals (such as marble, jade, bone). [PRECAUTIONS FOR USE] 1) - Tighten and straighten the handle of the rotary file before use. 2) - When cutting, move smoothly from right to left, uniform force to avoid jumps and bumps, the length of the tool handle should slow down the operation. 3) - Please keep a proper distance from the tool and wear protective glasses when operating.