Universal Fit Steel Rasp Bits Set fits most power drills, air tools, and die grinders Widely used for metalwork, tool making, model engineering, wood carving, jewellery making, welding, chamfering, casting, deburring, grinding, cylinder head porting and sculpting Universal Fit Steel Rasp Bits Set comes with Ball rasp – (Rasp head diameter: 12.8mm & rasp head length:12mm), cylindrical rasp – (Rasp head diameter :12.8mm & rasp head length:25mm), cone rasp – (Rasp head : 2.5-12.5mm & rasp head length:25mm) and vase rasp – (Rasp head:12.8mm & rasp head length:25mm) Shaft material: Steel