The HIVIZ MPB-TAC LiteWave H3 Plain Barrel snap on Sight combines tritium with the HIVIZ LitePipe technology for 24-hour illumination making it great for hunting, law enforcement, and home defense. This sight is rugged and durable, designed for the roughest use, and ensures fast sight acquisition day or night. FeaturesLow-profile, steel baseBrightest, fully encapsulated tritium24-hour illuminationFits most plain barrel shotguns with removable front beadIncludes five screws in varying thread sizes to fit nearly any shotgunFits Most 12 Gauge, Plain Barrel Shotguns