QUICK CHANGE SANDING DISC  For use on all types of carbon steel, Non-Ferrous metals (aluminum, copper, brass) ,stainless steel,and other alloys . For Material removal; Deburring; Weld grinding;Aesthetic finishing; Removing rust,corrosion, exit burrs, paints & heat discoloration. Material: abrasive cloth + lock; suitable for polishing all kinds of carbon steel, stainless steel, aluminum and other alloys. Deburring, weld grinding, finishing, eliminating thermal discoloration. It is used for grinding and polishing of aircraft, automobile, ship and other industries. SIZE GRIT MAX/PPM TYPE 1″ 24#---600# 30,000 R/S/P 1-1/2″ 24#---600# 30,000 R/S/P 2″ 24#---600# 30,000 R/S/P 3″ 24#---600# 25,000 R/S/P