Plastic Backing Sanding Pad Size:150,180mm Material of backing:Plastic Thread: 5/8-11UNC Good quality Plastic Backing Sanding Pad Size:150,180mmMaterial of backing:PlasticThread:5/8-11UNC Feature:1)Fits high speed angle grinders2)Professional dual Action Random orbital3)Max operating speed:10,000-13,000rpm Please inquire us for more information.