The Grainger 14R150 is a 14 inch diameter, 150 grit aluminum oxide grinding wheel. It features an open coat construction and is rated for a maximum safe speed of 6,600 RPM. The wheel has a 1 inch arbor hole and is 1 inch thick. It can be used for general purpose grinding, deburring, and stock removal on ferrous metals. This is a type 27 depressed center grinding wheel.