Leupold Alumina 50mm VX-L & Standard Lens Cover Kit Flip-back lens cover designed for Leupold VX-L and standard EP 50mm lenses Powerful neodymium magnet holds cover securely over the lens Triple O-ring seals provide max protection; flips open quickly and easily Clockable design lets you rotate cover to open in any direction Machined-aluminum precision construction; available in several sizes