Produce Name: Crimped Wire Cup BrushesFilltypes: 0.22/0.30/0.35mm, brass-coated wire, steel, stainless steel wireArbor hole D: M10x1.25; M10x1.5; M14x2.0; M5/8-11Size: 2.5", 3", 4", 4.5, " 5", 6"Rpm. Max: 12500/8500/6500/4500Purpose: . For high speed industial angle grinders; . Flexible brushing action is excellent in wide, flat and/or irregular surfaces