The 56mm Leupold Alumina Flip Back Lens Cover makes the perfect addition to an exceptional riflescope. Built to fit Leupold scopes manufactured after 2004 with 56mm objective lenses, these lens covers are made out of heavy-duty 6061-T6 aircraft aluminum. A strong neodymium magnet holds the cover shut and three O-ring seals insures protection from the elements. Leupold Alumina Flip Back Lens Cover - 56mm - VX-6 MPN 119737