This rear barrel sight will fit Marlin Model 1895, 1886 Winchester, 1876 Winchester replacement 3/8" dovetail. The top of the sight measures .375" high. The staff has elevation markings and the slide has a detent system that can be adjusted to lock it solidly in place with the thumb screw or allow elevation adjustments. Machined from bar stock and heat treated for long life. From the bottom of the sight to the top is .380" high. Please see photos.