Hardened, precision-ground, drop-in hammer lightens trigger pull by 35% on MK II pistols. Electro-polished to remove even minor imperfections for an ultra-smooth sear surface and a clean breaking, target-quality, trigger pull. Includes strut and pin. Mfg: Volquartsen SPECS: Machined steel, 1.05" (2.6cm) long, .56" (14mm) wide. Wt. .5 oz. (14 g). Fits Ruger MK II and .22/.45 pistols only.