This package carries (a)-(b). 3 Pieces of 4 / 100mm Diameter Diamond Grinding cup wheel for stone concrete travertine floor surface grinding. They are Grit 45, VELCRO BACKED. (b) 21 Pieces of. Thickness Diamond Polishing Pad for granite marble concrete terrazzo. 3 Pieces X Grit 50 100. 200 400 800 1500 3000. Description of the 10. 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.