HSP5016 Turbo-Cut™ Hard Back Disc w/ Hexpin® AttachmentClean, sand concrete and metal surfaces. Prep surfaces for new coatings. Fast, aggressive surface removal. Non loading. Silicon Carbide. Turbo Cut Disc series. For stone, cast iron, non ferrous metals and floor coatings. T 27 shape. Requires heavy duty rubber backup pads (BPFTC45, BPFTC50 or BPFTC70). Max RPM: 13,300. Discs come in packs of 25 (prices are for 25pcs) Back Up Pads come in packs of 1