4-1/2 In. 3/32 In. 7/8 In. Arbor 24 Grit Light Grinding/Metal Cutting Abrasive Wheel. Designed for use with small angle grinders. Type 27 depressed center wheel for grinding. For use on flat surfaces for weld preparation. Best used at a 30-degree angle. Aluminum oxide grain cuts high-tensile strength materials without excessive fracturing.