3M's top performing Cubitron II fiber 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. 111-128-inches center hole diameter. Coat type: closed coat. Converted form: fiber disc. Equipment - machines: right angle grinders. Form type: fiber. Max rpm: 13300. Max speed: 80 meter per second. Position: premium. Made of ceramic. Measures 4-1/2-inches diameter. 36+ Grit. Orange color.