The Lot Of 2 RIDGID 4" Diamond Cup Wheel (AWD40) is a high-quality metalworking supply designed for cup grinding tasks. With a durable diamond abrasive material and a grit size of 16, this grinding wheel is capable of handling a maximum speed of 15000 RPM to efficiently remove material and achieve precise results. The flaring cup design and 4-inch diameter make it suitable for a variety of grinding applications in the CNC, metalworking, and manufacturing industries. With a 5/8 inch-11 arbor hole size, this cup wheel is compatible with a range of machinery for added convenience.