This pack carries (a)-(d). Many other sellers DO NOT attach the lock ring. (b) 38 Pieces of 4 Diamond Polishing Pad. 9 X Grit 50 100. 7 X Grit 200 400. 2 X Grit 800 1500 3000. And 1 Piece of 4 Diamond Turbo grinding cup wheel for stone concrete surface grinding. And 1 X 4 aluminum backer/Pad Holder. (c) 1 Piece of B5 (5mm / 3/16″) Demi / Radius / Half Bullnose Diamond Brazed Router Bit/Profile Wheel for 5MM (3/16″) Thick or High stone concrete travertine. (d) 1 Piece of 4 Professional Grade Glaze Buffing Pad (to brings natural granite marble stone mirror like polished effect).