5PCS 1/4-inch Rotary Burr Rasp Set: Made of high quality carbon steel, fine black finishing for better rustproofing and wear resistance10PCS 1/8-inch Rotary Burr Files Set: Made of high quality HSS, high hardness, wear resistance and impact resistanceMulti-Purpose Use: Perfect for wood, plastic and rubber deburring, shaping and grooving. Suitable for grinding, polishing, shaping, carving, chamfering, deburring and burnishing. It is perfect for low hardness of the workpieceDrill File Set: A must-have tool for woodworkers and hobbyists who regularly clean welds, easy to master and use, safe and reliableType of Cutter Head: 15pcs rotary burrs includes ball, wheel, flat top cone, bullet, tapered flame, round tapered cylinder, cylinder square, etc. Can be used with different jobs