The Butler Creek Flip-Open Scope Cover Size 45 is the ultimate scope lens protection designed for hunters and shooters, delivering a watertight airtight seal that keeps dust and moisture at bay while allowing rapid, thumb-assisted opening to keep your eye on the target when opportunity strikes. Built with a fast flip-open design and silent spring hinges, these black covers prevent spooking game and lock onto your scope with water-tight custom-fit friction mounts that ensure a secure, semi-O-ring seal. Tested to -40F, they perform reliably in extreme conditions and remain truly ambidextrous for versatile use, weighing less than an ounce so they wont affect balance or handling. Crafted with quality in mind and manufactured in the Philippines, Butler Creeks Flip-Open Covers are tailored to size 45 to match your optics precisely, and their intuitive operation lets you shield your lenses during travel or rain, then flip them away with confidence to maintain a clear, unobstructed view for precise shooting.