Leupold 59050 Alumina Scope Cover Matte Black Aluminum 50mm Obj. Screw OnAlumina 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. Compatible with Leupold post 2004 riflescopes with 50mm objective lenses, except for VX L and VX 3L models.