Alumina Zirconia Grit fastened to glass-fibre reinforced resin backing plates are designed for fast paint and rust removal from steel. The advantages��abrasive flap discs are their low noise level and the constant surface finish until completely worn. Fine 120grit suitable for light surface finishing or levelling. Max 13300rpm 125mm - 80grit Inside Diameter 22.23mm Outside Diameter 125mm 125mm - 80grit