This Cubitron™ II Fibre Disc 987C is designed for stainless steel and other heat-sensitive applications. The proprietary 3M™ Precision Shaped Grain technology improves disc life (up to 2 times or more). It cuts faster and can increase productivity compared to other leading ceramic discs. It 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. The center hole diameter is 7/8in and the disc diameter is 7in. It has a 36+ grade. It is closed coat. It is orange in color. The backing material is fibre. It has a max RPM of 8600 and a max speed of 80 meters per second. 3M™ #: 05114127449.