This package carries (a)-(f) below. (a) one 4 GB USB, it includes two video, one of it is “How to Fabricate Granite countertop DIY Undermount sink”, the other is How to Fabricate Granite Countertop DIY, Profile & Polish. (b) 1 Piece of (1000W, 1000 to 4500 RPM adjustable, 110V, 5/8-11 Thread) New Version Wet Variable Speed Polisher. Many other sellers DO NOT attach the lock ring. (c) 5 Extra Pairs of Carbon Brush carbon brush is consumable parts of all types of grinder or polisher. They need to be replaced when they are exhuasted. (d) 28 Pieces of 5 (5 Inch) Diamond Polishing Pad for granite marble concrete travertine quartz glass. 5 X Grit 50 100 200 400. 2 X Grit 800 1500 3000 10 000. (e) 1 X 5″ Rigid Aluminum backer/Pad Holder, (5/8″-11 Thread arbor). (f) 1 X 5″ Flexible Rubber backer/Pad Holder, (5/8″-11 Thread arbor).