Designed 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 open make these Flip-Back lens covers stand above the rest. Round objective and ocular models can be rotated so they can open in any direction.