The Flame sight packs HIVIZ brightness into a low-profile, compact package. Its the perfect sight for the shotgun shooter who knows he wants either a bright green or red bead all the time in all conditions. Its low-profile design offers durability, and is a great choice for the rigors of the outdoor hunting environment. Fits most vent-ribbed shotguns with removeable front bead. Sight includes five screws in varying thread sizes to fit nearly any shotgun: 3-56; 5-40; 6-48; 3mm x 0.5; 3mm x 0.6. Round Litepipe Shape.