Butler Creek Flip Open 17 Objective

Simply the ultimate scope lens protection for hunters and shooters. They 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 a narrow window of opportunity in the most extreme conditions.

Features:
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 -40deg F.
Truly ambidextrous.
Weighs less than an ounce.
Size 40.9mm