This premium fibre disc features 3M's proprietary new ceramic mineral. Designed for mild steel metalworking applications such as weld grinding, beveling, flame-cut edge clean-up, and deburring. Designed for mild steel applications, the proprietary 3M Precision Shaped Grain technology improves disc life (up to 2 times or more), cuts faster and can increase productivity compared to other leading ceramic discs. Takes time out of edge chamfering, beveling and removing stainless steel welds, mill scale, pits and imperfections, machining grooves and more to deliver a lower cost per grind. -Precision-shaped abrasive grain - Cuts Fast - Lasts Longer - Runs Cooler - 7/8" center hole mount is compatible with 3M Disc Pad Face Plates and Hubs, and requires the use of a disc retainer nut (all sold separately) - Complete carbon steel solution