Forney 71890 Grinding Wheel with 5/8-Inch-11 Threaded Arbor, Aluminum Type 27, AC46, 7-Inch-by-1/4-Inch Aluminum oxide and silicon carbide aluminum grinding wheel Designed for aluminum grinding, body work, fabrication and general repair work Used on non-ferrous materials Designed to be used on right angle grinders Aluminum oxide and silicon carbide aluminum grinding wheel Used on non-ferrous materials Designed to be used on right angle grinders