... Rotary Burrs,Rotary Files,Carbide burrs,carbide file,Tungsten steel grinder,tungsten rotary bur Uses: 1 clear casting, forging, welding pieces ... of the flying edge, burr and weld. 2 abrasive finishing metals. 3 of the rotation ... non-metallic sculpture of the process.steel bur(Tungsten steel grinder,Rotary Files)