Used extensively by the top shooters, military snipers and hunters. Completely weatherproof and keep rain, snow and dust off your optics. Also keeps harmful debris from scratching or abusing these lenses. Includes an ocular cover with a red button and an objective cover with push tabs. These covers open in an instant with the push of your thumbs, they spring up and out of the way quickly and dependably. Select your covers by either using the convenient size chart based on your scope or by measuring the outside diameter of the two scope bells. Then take that measurement and reference the cover measurement listing. Select the cover that is closest with .01 under size and .025 over the size range. 1.55 rating.