8 Pieces of 7" Diamond Polishing Pad (3mm Thick) for concrete stone. * 8 Pads are: 1 X Grit 50 100 200 400 800 1500 3000 6000Buff. * And 1 Piece of 7" Rubber Backer/Pad Holder (5/8"-11 thread). * Remind: Rubber Backer"s max capacity is 5000RPM. Pls don"t use it with high speed grinder/polisher.