Butler Creek Flip Open 46 Objective Lens Cover This Butler Creek flip-up objective lens cover opens at the touch of your thumb and features a watertight friction mount and semi O-ring that securely anchors the cover, sealing out dust and moisture. The objective lens covers feature two finger tabs extending from both sides of the cap, perfect for right or left handed shooters to quickly open the caps for that shot of a lifetime. Product Specs: 61.70 mm 2.430 inches