SAIT® Cup Wheel, General Purpose, series: C16, 6 in Wheel dia, 2 in Wheel Thickness, C16 Grit, Coarse Grade, Silicon Carbide Abrasive, Wheel Type Number: Type 11, 6050 RPM Maximum, Applicable Materials: Masonry, Concrete and Stone, 5/8-11 Center Hole Thread, Cup Wheel. SAIT® 26021 C16 General Purpose Cup Wheel, 6 in dia x 2 in Thick, C16 Grit, Silicon Carbide Abrasive