Product Description Leupold Alumina Flip Back Lens Cover Kit Amazon.com Leupold optics have long set the standard for high performance, and now, with Alumina accessories, the company sets the standard for adaptability, too. Each Alumina flip-back lens cover features a powerful neodymium magnet to hold it securely closed over the lens, along with triple O-ring seals for maximum protection from the elements. More significantly, the cover flips open easily when you want to view an object through your Leupold 50mm riflescope, so you don't need to manually remove the cover before targeting an object. The cover is even clockable, so you can rotate it to open in any direction. Other details include a machined-aluminum precision construction, a low-profile design, and quick and easy operation. This particular cover is designed for Leupold 50mm and standard EP lenses, but covers are available for a variety of other sizes of eyepieces and objective lenses. About Leupold From humble immigrant beginnings, Leupold grew--based on a promise of quality--to become a classic American company. In 1907, Fred Leupold set up a one-man shop at 5th and Oak streets in Portland to repair surveying equipment. He was joined by his brother-in-law, Adam Voelpel, and later by inventor John Cyprian Stevens, and the foundations for a century of success were in place. During Leupold’s second half-century, the company focused heavily on the sports optics business. Leupold’s presence in the hunting and shooting market expanded with innovative optics and features that are now legendary among hunters, shooters, and outdoors enthusiasts. Many of the industry’s standards--nitrogen waterproofing, the Duplex reticle, and more--were Leupold creations.