【Measuring】Please measure the Outside diameter (including armouring) of the barrels to get accurate sizing, if the tubes outer diameter is between 51.8-53.3mm, it will fit perfect. If the diameter is different, please choose a different size. 【Fits Models】Fits most 42mm models including 8x42, 10x42 and 12x42. These covers also fit several binoculars / monoculars with objective lenses between 40-44mm as well as some scopes. 【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 lens covers on the outside barrel of your binocular/monocular to protect your lenses. Covers remain attached to the binocular barrel and hang down when in use. 【Design】High quality flexible rubber is independently tethered and stretches for a tight fit. This ensures optimal protection for each lens.