(b)9 Pieces of 4" Diamond Polishing Pad for granite marble concrete. 1 Piece of B13 (13mm / 1/2"). And 1 Piece of 4" Velcro Backer/Pad Holder. -ideal speed of grinder/polisher: 3500-4500 RPM. VERY IMPORTANT REMIND: Velcro Backer's max velocity / capacity is 5000RPM.
eBay