Greatly enhance speed of target acquisition and accuracy. Tri Fiber clamp on sight contain (3) fibers which work to quickly funnel your eye to target. The 0.078 fibers provide a bright and easy to see. Easy upgrade to typical front bead. Extremely useful in lower light situations. Available in 12 and 20 ga. Removal of front bead not required for installation. Fits most plain barrel shotguns without vent rib.