The perfect shop hammer! Designed and built specifically for bicycle work, the Park Tool HMR-4 Shop Hammer has a fiberglass shaft, a soft touch rubber grip, and a two-sided head—steel on one side and a replaceable plastic head (part #293) on the other side.   Park Tool HMR-4 Shop Hammer Features  The perfect workshop hammer! Fiberglass shaft with soft touch rubber grip A unique, two-sided head with both steel and replaceable plastic striking surfaces: ideal to tackle any job Covered by Park Tool's legendary limited lifetime warranty