Depressed Center Wheels, Abrasive Wheel Type Type 27, Abrasive Wheel Diameter 4 1/2 in, Thickness 0.045 in, Arbor Hole Size 7/8 in, Abrasive Material Ceramic, Abrasive Grit 36, Max. RPM 13, 300 RPM, Series Saitech (TM), Grade Extra Coarse, Application Ferrous Metal, Stainless. This item has been restricted from sale in the following state (s): []