TriViz fully adjustable sight set. The triangular sight picture has a natural sight alignment and allows a full view of the target. Fits most shotguns with ventilated ribs from 1/4 inches to 3/8 inches wide with removable front beads. Features: Fits vent-ribbed shotguns from 1/4 to 3/8 inches with removable front bead LitePipe shape - triangular (3 inches different heights) and round