This package carries (a)-(c). Many other sellers DO NOT attach the lock ring. (b) 21 Pieces of 4 Diamond Polishing Pad for stone granite marble concrete terrazzo. Pas thickness is 3.2mm. 3 X Grit 50 100 200 400 800 1500 3000. And 3 pieces of 4 Professional Grade Glaze Buffing Pad. (they bring stone granite marble mirror like polished result). And 3 Pieces X 4 Aluminum backer/Pad Holder. (c) 1 Pieces of Triad Planetary Plate (work with this polisher). This Planetary machine combines proven planetary. The Triad Planetary Polisher is a. Rugged, planetary powered tool designed to produce a flat. Swirl free finish on counter tops, floors, walls and steps. Unit will grind, hone, polish and clean concrete, terrazzo. Marble and granite surfaces using diamond abrasives. A true planetary gear driven tool.