The Phat Hammer incorporates a 2-piece body design, a stainless steel front for durability and a brass body for extra weight to hit the exhaust valve harder, allowing you to run at lower pressures. The Phat Hammer also includes a 1/4x28 hardened lug w/ nylon set screw to keep it from slipping. We have now added a relief cut in the bottom of the hammer in case you grab a rear grip frame screw thats a bit to long.