Be used for removing rust from metal and nonmetal surface,removing burr,grinding melding seam,polishing wooden furniture by air tools and electric tools. 1) abrasive grain:aluminum oxide 2)bond:resin over resin 3)Size:4",4.5",5",6",7",9" 4)Grit:P16-P400 5)Application:as overs ,it is widely used in auto,aviation,machinery,instrument,construction and so on.