The potential accuracy of aperture sights with the sighting speed of open sights. All steel construction. Easy-to-install, fully machined, all-steel sights with windage and elevation-adjustable bases are pre-machined to fit quickly using the rear scope base holes on many popular rifles. A fast, accurate sight for brush hunting applications. Adjustments are secured with dual setscrews. Mfg: Xs Sight Systems SPECS: Steel, blue, matte finish. .191" (4.8mm) diameter aperture.