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. Ultra Narrow Model (S200) fits ribs from 0.171 to 0.265 (11/64 to 17/64) (4.2mm to 6.7mm).