The Magni-Hunter with Magni-Optics technology utilizes powerful, rare earth magnets to attach this cross-eye dominance solving sight easily yet firmly to the rib of nearly any shotgun. Featuring easily replaceable LitePipes in red and green, Magni-Hunter promises a quick-attach solution to any shooter battling eye dominance issues. Narrow Model (MGH2007-I) fits ribs from 0.230 to 0.330 (15/64 to 21/64) (5.8mm to 8.3mm).