HIVIZ resin overmold design; Most durable sight available; All steel construction; LitePipe diameter 0.090; Blade width 0.125 X 0.165 tall; Limited lifetime warranty under normal conditions and proper use of firearm; Fixed Green Color; Pinned sights must be fit and drilled for the pin. we recommend installation by a qualified gunsmith; Fits Smith & Wesson 617, 647 and 648 revolver models. The installed sight height is .165 inches