Aluminum Oxide BENCH GRINDING WHEEL VITRIFIRD 6" x 1" x 1" 60 Grit Bench Grinder,1" x 1" 60 Grit Bench Grinder Aluminum Oxide BENCH GRINDING WHEEL VITRIFIRD 6" x, 6" x 1"x 1" BENCH GRINDING WHEEL, Abrasive: Alminum Oxide, If you want the best, then that is it ,Grade Code 60 Grit ( 40 100 Grit also available ), x 1" x 1" 60 Grit Bench Grinder Aluminum Oxide BENCH GRINDING WHEEL VITRIFIRD 6".