Machined aluminum construction with anodized finish; Unbreakable polycarbonate lens with scratch-resistant coating. O-ring sealed. One handed snap-on/tighten interface keeps hands away from muzzle when attaching/detaching. Mounts directly to all MIL-STD-1913 (Picatinny) rails and weapons with Glock-style rails. Securely fits a broad range of weapons; Includes keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW.