Bosch CG27M450 4-1/2 In. 3/32 In. 7/8 In. Arbor Type 27 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