We have attached 3 extra pairs of carbon brush in this package. Carbon brush is consumable parts of all types of polisher or grinder. They need to be replaced when they are exhausted, otherwise polisher stop working. This pack carries (a)-(d). Many other sellers DO NOT attach the lock ring. (b) 39 Pieces of 4 Diamond wet dry (wet use recommended) Polishing Pad for stone concrete granite marble travertine sandstone quartz. 8 X Grit 50. 7 X Grit 100 200 400. 4 X Grit 800. 3 X Grit 1500 3000. (c) 1 Piece of 4 Diamond Glaze Buff (it brings mirror like polished result to natural granite marble). And 1 X 4 Aluminum backer/Pad Holder. (d) 1 Piece of the 4″ to 5″ Dust Shroud. Emovable front edge of shroud make it possible to grind close to wall or edge. It captures up to 99.4% of airborne particles for outstanding dust control that preserves air quality and protects the user from harmful working environment. It fits all 4″ or up to 5″ grinder/polisher.