Standard Pack = 1 piece(s). Color and Bond = Gray Vitrified ; Diameter = 1 1/2 IN ; Grit Size = 60 IN ; Hardness = J ; Hole Size = 3/8 IN ; Material = Aluminum Oxide ; Recess = 5/8 IN x 1/2 IN ; Size = 1 1/2 IN x 1 IN x 3/8 IN ; Thickness = 1 IN ; Wheel Type = Type 5 ;