Solid steel ramps for custom fitting fiber optic, ivory and brass bead sight blades. Available in two heights and four barrel contours to fit a wide selection of current and older production rifles. Ramp attaches to barrel with a single screw under the sight body and solder; flat base is drilled for two mounting screws. Mfg: Marble Arms SPECS: Steel, blue, polished finish. .340" (8.6mm) wide. 2" (5cm) long. Height is measured from the top of barrel to the bottom of the dovetail.