Flap disc ,flap wheel, CHINA NO.1 PROFESSIONAL MANUFACTURER OF FLAP DISC 1. Diameter: 4'',5'',6'', 7'' 2. Grain: 40#-320# Flap disc, flap wheel/ abrasives disc/abrasives ... polishing disc /mop disc/1. Diameter: 4'',5'',6'', 7''2. Grain ... , THE SURFACE WILL BE MORE SHINE AND SMOOTH . ZA flap disc with ABS BACK SUPPORT