Protect your riflescope with the Butler Creek Size 27 Flip-Open Scope Cover. The cover features a fast, flip-open design so you can keep your eye on the target. The cover has watertight custom-fit friction mounts that anchor to your scope, and an airtight semi-O-ring keeps out dust and moisture. The silent spring hinges won't spook game, and the cover is also designed for use with spotting scopes. Weighs less than 1 oz. Tested to -40°F. Ambidextrous.