Depressed Center Wheels, Abrasive Wheel Type Type 27, Abrasive Wheel Diameter 4 1/2 in, Thickness 0.25 in, Arbor Hole Size 7/8 in, Abrasive Material Aluminum Oxide, Abrasive Grit 46, Max. RPM 13, 300 RPM, Series A46N, Grade Coarse, Application Aluminum, Nonferrous Materials. This item has been restricted from sale in the following state (s): []