The HiViz TriComp addresses the fundamental concepts of triangulation, pointing and eye/hand coordination. It features interchangeable LitePipes, no tools needed, three triangular and three round LitePipes in varied colors & heights. 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"; 3mmx.5; 3mmx.6.