Meda 6 x 1 x 1-1/4, 80I (Medium) Plate Mounted Silicon Carbide Green Grinding Wheel Grit: 80 (medium) Hardness: I 6" diameter x 1" thick x 1 1/4" hole. 4 bolt holes in metal back for mounting. Green Silicon Carbide Grinding Wheel for Baldor & Similar Grinders. With Metal Back.