The Leupold Alumina Flip-Open Cover Eyepiece 20mm to 50mm Machined Aluminum delivers lightweight durability and reliable protection for optics, featuring machined aluminum construction that stands up to harsh weather and rugged use in the field. Available in sizes from 20mm to 50mm, these flip-open covers are compatible with both objective lenses and eyepieces, ensuring a snug fit without adding bulk to your rifle setup. Powerful neodymium magnets secure a watertight seal, guarding against moisture, dust, and debris so you can focus on your target with confidence. The flip-open design pivots cleanly and returns to a low-profile horizontal position, providing quick access when you need to view through your optics while maintaining a streamlined profile during rapid shots. Whether youre dialing in at the range or navigating challenging outdoor environments, this Leupold Alumina cover is engineered to keep optics clean, protected, and ready for action, enhancing your shooting performance with dependable protection and a minimal footprint.