The Butler Creek 30020 is specifically crafted for hunters and shooters who need high-grade lens protection. The Flip-Open scope covers not only provide a perfect fit to your scope, but also establish an airtight and watertight seal. This ensures absolute protection in the harshest weather conditions. Operation is simple with just a light touch of your thumb required to open, thus allowing you to take your shot during the most fleeting window of opportunity. Its quick, flip-open design features a silent hinge, ensuring your focus remains solely on your target without fear of scaring off game. Despite its outstanding features, it maintains a light construction, weighing less than an ounce. It proves its durability by functioning flawlessly even at temperatures as low as -40 degrees F. The compatibility range is noteworthy too, fitting .01 under and .025 over the specified measurements.