The Milwaukee 49-94-4500 is a 4-1/2 in. x 0.045 in. x 7/8 in. Cut-Off Wheel (Type 1). Milwaukee's comprehensive offering of grinding and cutting wheels consists of 45 unique products ranging in diameters from 4-1/2 in. to 14 in. with arbor configurations of 7/8 in. 20 mm, 1 in. and 5/8 in. - 11. Milwaukee's abrasive offering is manufactured using 3 types of abrasive grains, Aluminum Oxide, Silicon Carbide and Zirconia Alumina, providing products for general purpose to specialized high performance applications.