The TLR Series are powerful, intensely bright, long running, aluminum-bodied gun mount lights that set a whole new standard for durability. They're shockproof, dustproof, and virtually indestructible. The 3-watt Super High-Flux LED won't break or burn out. The rail grip clamp system securely attaches/detaches quickly and easily with no tools and without putting your hands in front of the muzzle. And they fit most handguns with Glock-style rails as well as long guns with 1913 (Picatinny-style) rails.