The Butler Creek 30040 Flip-Open Scope Cover in Black Polymer delivers ultimate lens protection for hunters and shooters, precisely sized for a 27.80mm objective and size 04, with a custom-fit that creates a watertight, airtight seal and a fast flip-open design that keeps your eye on the target in demanding conditions. Built with silent spring hinges, these covers wont spook game, while the water-tight friction mounts securely anchor to your scope and the air-tight semi-O-ring keeps out dust and moisture, ensuring clear optics when it matters most. Tested to -40F, the cover remains reliable in extreme environments and its truly ambidextrous design suits any user, weighing less than an ounce for minimal added bulk. The 04 manufacturer size ensures a precise fit, combining rugged durability with effortless operation so you can transition from pre-shot to follow-through with a simple thumb touch. This scope cover from Butler Creek protects your valuable optics against weather, debris, and wear, extending lens life and maintaining visibility across hunting, tactical, or recreational shooting scenarios.