Grain : silicon carbide Backing : Fiber paper as backing Grit: 16-120# coating: close Idea for It is used for grinding, poloishing,deburring,and derusting operations of various surfaces such as metal, rubber, leather and furniture,etcSize: 100*16mm,115*22mm,125*.22mm,180*22mmwe can offer OEM service! round hole/ cross hole silicon carbide fiber disc