Binocular Rainguard / Eyepiece / Eyecup Cover Rubber Caps Sizes 42-45MM 【Measuring】Please measure the Ocular Lens outer tube's diameter to get accurate sizing, please choose the lens cover with the internal diameter which matches your measurement, it will fit perfect. If the diameter is different, please choose a different size. 【Protection】These covers protect your lenses from rain, dust and scratches in any weather or environment. They also offer protection to your lenses in transit and storage.  【Easy to Remove / Add】Place the rainguard cover on the Ocular Lenses outer tubes to protect your lenses. You can conveniently attach to your binocular strap to keep within easy reach. 【Design】The high quality one piece flexible cover stretches for a tight fit. This ensures optimal protection for each Ocular lens.