QUICK CHANGE POLISHING DISC Features: The surface conditioning disc can improve smoothness,it has high efficient and more safety. Threaded screw back easily attaches and detaches to and from mandrel，the surface disc  can be quickly assembled and disassembled... The surface disc can withstand high speed,it has long life and it is durable. Material: nylon polishing cloth + lock; suitable for polishing all kinds of carbon steel, stainless steel, aluminum and other alloys. Deburring, weld grinding, finishing, eliminating thermal discoloration. There are three types: coarse, medium and fine.It is used for grinding and polishing of aircraft, automobile, ship and other industries. SIZE GRIT MAX/PPM TYPE 1″ COARSE/MEDIUM/FINE BROWN/RED/BLUE 25,000 R/S/P 1-1/2″ COARSE/MEDIUM/FINE BROWN/RED/BLUE 25,000 R/S/P 2″ COARSE/MEDIUM/FINE BROWN/RED/BLUE 25,000 R/S/P 3″ COARSE/MEDIUM/FINE BROWN/RED/BLUE 25,000 R/S/P