This package (a)-(b). (a) 3 Piece of 4″ / 100 mm (5/8″-11 Thread arbor) Aluminum Backer / Pad holder for diamond polishing pad. (b) 36 Pieces of 4 (11 mm Thick) Diamond Floor Counter top Polishing / Renew Pad for granite marble concrete travertine. Thickness Diamond Polishing Pad for granite marble concrete terrazzo. 6 Pieces X Grit 50. 100 200 400 800. 3 Pieces X Grit 1500 3000. Description of the 11. Much aggressive to do mirror effect, -Velcro backed, can be attached to the floor polishing machines, -Used dry or wet. Designed for floor machines to polish, restore and maintain the concrete floor, terrazzo floor and granite floor.