Nylon abrasive, which is made by sticking intertwined nylon fiber with abrasive, is used.While the abrasive material of the paper polishing cloth directly strikes the polishing materials, the textile of nylon abrasive material acts as a cushion by the intertwined fiber and prevents the polishing materials from being excessively scraped.Since it is large authigenesis, it does not get clogged.Welding burn removal, curve surface of woodwork, R part sealer sanding, finishing before painting, satin finish, mirror surface pre-processing, paint removal.Grain Size (#):120Outer Diameter x Thickness x Hole Diameter (mm):125 x 15 x 16Max Working Rotation Speed (rpm):4000Layers of Non-Woven Fabric (sheet):35Max Working Peripheral Velocity: 26.2m/s (1570m/min)Only ?3100 adapter for 15mm hole 1 piece per box (sold separately: GPTA-1P)