Our most economical magnetic sight, the S-Series offers the bare basics to a shooter who knows exactly what color sight he likes. This sight presents a bright, affordable sight picture to any shotgun shooter. LitePipes are not interchangeable, so what you see is what you get. Wide Model (S400) fits ribs from 0.328 to 0.437 (21/64 to 7/16) (8.3mm to 11.1mm).