Leupold 118772 Pro Gear Alumina Matte Black Aluminum 56mm Obj. 3" x 56mm Screw OnDesigned for Leupold scopes built after 2003, Alumina Flip Back lens covers feature powerful neodymium magnets to hold them securely closed and triple O ring seals for provide maximum protection from the elements. The cover opens silently and folds flat against the scope in the open position. Constructed out of durable 6061 T6 aircraft grade aluminum, they are precisely machined to allow for quick and easy operation, and a low profile position, when