Hi Viz Tri Viz Sight - Front and rear combo. Mounts on any vent-ribbed shotgun with removable front bead. Includes 4 green litepipes (3 triangular, 1 round). Elevation adjusted by changing front litepipe heights, rear adjustable for windage. Front and rear combo;Mounts on any vent-ribbed shotgun;Includes 4 green litepipes (3 triangular, 1 round)