This pack carries (a)-(d). Many other sellers DO NOT attach the lock ring. (b) 32 Pieces of 4 Diamond Polishing Pad. 7 X Grit 50 100. 6 X Grit 200 400. 2 X Grit 800 1500 3000. And 1 X 4 aluminum backer/Pad Holder. (c) 1 Piece of B25 (25mm / 1) Demi / Radius / Half Bullnose Diamond Brazed Router Bit/Profile Wheel for 25 MM Thick or High stone concrete travertine. (d) 1 Piece of 4 Professional Grade Glaze Buffing Pad (to bring natural granite marble stone mirror like polished effect).