Hi-Viz S&W DX Revolver Front Sight Height 0.250" - Red Hi-Viz sight for S&W revolvers Revolvers need to have DX Style front sight Resin overmold the LitePipe Measured height is .250 Fits revolver with interchangeable spring detent plunger style front Smith and Wesson front revolver sight .250 height Resin overmolded red front sight Fits any Smith and Wesson revolver with interchangeable spring detent plunger style front Height is measured from top of blade to bottom of blade excluding dovetail HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.