CGW Coated Abrasive Disc, High Performance Quick-Lock, 5 in Diameter Disc, 5/8-11 Center Hole, 50 Grit, Medium Grade, Zirconia Alumina Abrasive, Resin Fiber Backing, Threaded Attachment, Applicable Materials: Stainless Steel, Inconel, Titanium and Tool Steel, 12200 rpm Maximum