Features and Benefits:Grind, deburr and blend on all metals.Centrifugal force expands the wheel to grip the abrasive.One-piece construction; specially designed for use with spiral bands.Slots provide air flow that enables the wheel to run cooler than solid rubber.65 durometer natural rubber with 1/4" cold rolled steel shank for excellent concentricity.Dynabrade 92913 1-1/2" x 1" Slotted Wheel, 1/4" Shank