1. Black & Decker Valve Seat Grinding Stones Set Of 10 Pcs For 9/16" Thread 80 Grit. 2. Set contains each of the following Sizes: 1-1/8" (1 Pc Pink) ,1-1/4" (1 Pc Pink) ,1-3/8" (1 Pc Pink) ,1-1/2" (1 Pc Pink) ,1-5/8" (1 Pc Pink) ,1-3/4" (1 Pc Pink) ,1-7/8" (1 Pc Pink) ,2" (1 Pc Pink) ,2-1/4" (1 Pc Pink) ,2-1/2" (1 Pc Pink) 3. The Stones can be dressed to any angle with Thread Intact. 4. We made heavy duty stones of thread size of 9/16". 5. Verified Bond 80 Grit medium aluminium oxide pink Stones.