TruGlo Fiber Optic Sight Set Fits Henry Golden Boy .22 Magnum, .17 HMR and Henry Big Boy .357, .45 Colt- Replaces existing factory sights.br- Full windage and elevation adjustment.br- CNC-machined.br- Not for barrels.br- Front diameter is .060?.br- Rear diameter is .035?.br- Front sight height is approximately 0.500?.