Amazon.com: WORKPRO 10 Pack Grinding Wheels, General Metal Grinding Wheel for Metal, Stainless Steel, etc. Aggressive Grinding Disc for Angle Grinder, Type 27 Depressed Center Disc, 4-1/2" x 15/64" x 7/8" :
045" Cutting Wheels Type 27/Type 42,Z-Tech High Performance, 5/8"-11 Hub 23322 - Strobels Supply