3M's top performing cubitron II fibre disc 987C raises the bar for durability. 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), 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. 2X life, fastest cut. Cool running. Use wet or dry. Complete stainless steel solution. Backing material: fibre. Center hole diameter: 0.87". Coat type: closed coat. Orange color. Diameter: 4-1/2". Grade: 60+. Maximum RPM: 13300. Maximum speed: 80 meter per second. Mineral type: precision shaped ceramic grain.