Standard Pack = 1 piece(s). Color and Bond = Green Aluminum Oxide Vitrified ; Diameter = 24 IN ; Grit Size = 60 IN ; Hardness = K ; Hole Size = 12 IN ; Material = Aluminum Oxide ; Size = 24 IN x 3 IN x 12 IN ; Thickness = 3 IN ; Type = Centerless and Cylindrical Wheel ; Wheel Type = Type 1 ;