When the lights go out, your sidearm doesnt need to be left in the dark. TRITIUM PRO night sights transition from standard white dot sights during the daylight, to glowing green dots in the dark. Tritium does not need batteries and does not need to be charged with light it simply glows! Front sight FOCUSLOCK ring for even faster focus. Assembled in the U.S.A. with quality Swiss tritium for maximum brightness. Fits most standard holsters. This model fits 1911 5″ Government .45 ACP, Ruger SR1911 models with fixed rear sight *Reference to Novak LoMount is for compatibility use only. This product is not endorsed by, or affiliated with Novak Designs, Inc. Front Sight Length: 1.0″. Front Sight Width: 1.0″. Front Sight Height: 1.0″. Rear Sight Length: 1.0″. Rear Sight Width: 1.0″. Rear Sight Height: 1.0″.