It is a wire EDM-cut, fully machined (no casting or stampings) hammer. It will provide a 50% (approx) lighter trigger pull. It is a drop-in item designed to be used in an unaltered factory trigger guard. Made of A2 tool steel, hardened to Rc 58-60. Fits the Remington 597 22LR, 22 WMR and 17 HMR.