Butler Creek Size 2, Flip-Open Scope Cover 1.221 Objective Lens Simply the ultimate scope lens protection for hunters and shooters. They’re custom fit to your scope, create a watertight, airtight seal and open with a touch of your thumb, so you can put your shot through the narrow window of opportunity in the most extreme conditions. - Fast, flip-open design keeps your eye on the target. - Silent spring hinges won’t spook game. - Water-tight, custom fit friction mounts anchor them to your scope. - Air-tight semi-O-ring keeps out dust and moisture. - Tested to –40°F. - Truly ambidextrous. - Weigh less than an ounce. - Also made for spotting scopes.