LPA TXT Fiber Optic Target Tactical Sight Set for S&W Revolvers (Stainless Finish) Fiber optic sight set in stainless finish Fits Smith & Wesson Revolvers with drilled and tapped frames Fits S&W 629 686 586 617 66 67 696 17 19 657 610 625 29 27 and new caliber 50 Width of the entire face of the blade .750...Depth of the face of the blade .295 Width of the Notch .115...Depth of the Notch .070