4" Pro Diamond Polishing Pads Set of 14 PCS with Black Buff and Aluminum Back Holder 1 Piece of 4" Aluminum Pad Holder (5/8" thread arbor). 1 Piece of 4" Super Grade Black Buff (it brings super Mirror Result). 13 Pieces of 4" Diamond Polishing Pad for granite marble concrete: 3 Pcs X Grit 50, 2 Pcs X grit 100 200 400 800, 1 Pcs X Grit 1500 3000.