jiaping 6x5pk HSS Rotary Files Burr Drill Rotary Rasp Burr Electric Grinder Set 6mm.5PCS Double Cut Solid Carbide Rotary Burr Set, 6mm(1/4in)shank, fits most small rotary tools.Made of HSS Steel heat-treated double cut carbide that lasts long working life.Excellentfor fine detail work,widely used for metalwork, tool making, modelengineering, wood carving, jewelry making,welding, chamfering, casting,deburring, grinding,ect.Suitable for all skill level, this is aessential for woodworkers & enthusiasts who cleans up welds with metal frequently, easy to grasp and use, and reliable.Generally can be used with handheld electric or pneumatic .jiaping 6x5pk HSS Rotary Files Burr Drill Rotary Rasp Burr Electric Grinder Set 6mm