The flip-open caps for the eyepiece and the objective lens are a modern solution that effectively protects the hunting optics against scratches, dampness, dust and impacts. The flip-open cap is locked and opened with only one finger, so it is practical to use. The opening lever is very quiet, it's the most open flip-open cover on the market! In addition, it is waterproof and does not crumble at low temperatures (made - elastic ABS plastic) 62.5 mm - Inner diameter.