Aimpoint Hunter H30 Flip-Up Rear Lens Cover Kit. This piece of Rifle Scope Gear from Aimpoint is a patented rotary flip-up lens cap that mechanically rotates open and stays closed (similar to a book) until you open it. The Aimpoint H30 Flip-up Lens Cap fits all Aimpoint Red Dot Sights with 30mm objective. This Aimpoint Rifle Scope Lens Cover has an O-ring that keeps the cover on the rod so it can rotate up and down without having to change any set-up settings on the scope. For a great way to make sure you are using the best possible scope lens protection choose the Aimpoint Flip-up Red Dot Lens Cover Kit . Package Contents: Aimpoint Hunter H30S/H30L Flip-Up Rear Lens Cover Kit Aimpoint Hunter H30 Flip-Up Rear Lens Cover Kit 200354