The Simplex hammer head housing only; without inserts or handle; with integrated handle-protection sleeve. Allows the custom-build of a Simplex mallet that suits your specific needs perfectly. Required hardware for assembly as bolt; nut and spring washer; is included. Reinforced cast steel. This reinforced cast steel housing is virtually bullet-proof with thicker walls and braces. Great for use in combination with copper inserts. The higher weight of this hammer head weight delivers best impact power; making the weight work for you; requiring the least amount of physical force. Comes with a black powder coated finish. Note: Not for use with wooden handles. Compatible with fiberglass handles only Diameter: 50mm. Weight: 785 gram.