This pack carries (a)-(d). Many other sellers DO NOT attach the lock ring. (b) 46 Pieces of 4 Diamond Polishing Pad. 10 X Grit 50 100. 9 X Grit 200 400. 3 X Grit 800 1500. 2 X Grit 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 B10 (10mm / 3/8″) Demi / Radius / Half Bullnose Diamond Brazed Router Bit/Profile Wheel for 10MM (3/8″) Thick or High stone concrete travertine to do Demi shape bullnose. (d) 1 Piece of 4 Professional Grade Glaze Buffing Pad (to brings natural granite marble mirror like polished effect).