Saint-Gobain Abrasives enhanced Norton Gemini wheels feature a new premium alumina grain
Norton Abrasives - St. Gobain 43585 Gemini Fast Cut Aluminium Oxide Abrasive Type 27 Grinding Wheel, Depressed Center Wheel, Max 13,580 RPM, 5/8"-11 Hub, 4-1/2" Diameter x 1/4" Thick (Pack of 10):
Norton Dish Grinding Wheels For Precision Grinding - SAIC Ltd.
Norton® 66253044379 39C Straight Toolroom Wheel, 8 in Dia x 1 in THK, 1-1/4 in Center Hole, 100 Grit, Silicon Carbide Abrasive | DGI Supply