5" x 3/4" BENCH GRINDING WHEEL 100 grit Vitrified 1" Arbor includes 3/4" 5/8" 1/2" Bushing Abrasive: Aluminum Oxide Dimension: 5" dia x 3/4" width Bore : 1" includes 3/4" 5/8" 1/2" Bushing Grade Code : 100 Grit Bond : Vitrified