3M - 2" Disc Diam, 50 Grit, Zirconia Alumina Quick Change Disc - Type S Attaching System, Coated, Black, Coarse Grade, 25,000 RPM, 501C Series

Type S attachment systems feature a turn-on/turn-off style fastener (1/4-1/2 turn to lock in place). They are interchangeable with TS and Type II Styles.

More durable than aluminum oxide, zirconia-alumina is best for medium- to heavy-material removal. The material grains constantly fracture to produce new sharp edges. Commonly used on carbon steels, aerospace alloys, nickel alloys, aluminum, cast iron, forgings and some stainless steels.