Night Sights Classic are machined steel, tritium front and rear, and bright white outlines. They are GL-112 front + GTR 650/690 rear. The rear notch is .150" and the width of the front blade is .140". AmeriGlo sights are machined from us-made bar stock steels and assembled using Swiss-made tritium light sources. They specialize in iron sights for small arms, designing their own sights and working with OEM gun companies. AmeriGlo sights are used worldwide by law enforcement, military, defense-minded free citizens, and recreational shooters.