3 Extra pairs of carbon brush are included in this package. Carbon brush is consumable parts of all types of polisher. They need to be replaced when they are exhausted, otherwise polisher stop working. This package carries (a)-(d). Many other sellers DO NOT attach the lock ring. (b) 7 Pieces of 4 Diamond Polishing Pad for countertop floor surface polishing. 1 X Grit 50 100 200 400 800 1500 3000. And 1 piece of 4 Professional Grade Glaze Buffing Pad (it brings natural granite marble mirror like polished result). And 1 X 4 Aluminum backer/Pad Holder. (c) 7 Pieces of 4 Diamond convex polishing pad for granite marble concrete sink basin polishing. And 1 Piece of 4 convex shape rubber pad holder. (d) 1 Piece of B20 (20mm / 3/4″) Demi / Radius / Half Bullnose Diamond Brazed Router Bit/Profile Wheel for 20MM (3/4″) HIGH OR THICK STONE CONCRETE.