Improve the performance of your S&W revolver with the HIVIZ interchangeable sight. Our bright and ultra-durable sights will enhance your confidence and shooting experience. Features: HIVIZ resin overmold design Most durable sight available All steel construction LitePipe diameter 0.09 inches Blade width 0.125 x 0.165 tall Limited lifetime warranty under normal conditions and proper use of firearm 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 0.165 inches