Rubber Eye Guards Kit for Adult Microscopes Telescopes and Binoculars 2 Pack (Fits 42 to 48 mm) Overview worn or missing eyecups with this 2 piece rubber eye guard kit designed for adult use. Soft rubber construction and a flexible fit make these eyecups suitable for a range of optical instruments with eyepiece diameters between 42 and 48 mm. Key benefits Comfortable viewing: soft, flexible rubber creates a cushioned rim around the eyepiece to make extended observation sessions more comfortable. Better light control: the contoured cup helps block stray light and glare entering the eye from the sides, improving contrast in bright conditions. Wide compatibility: fits most eyepieces with a diameter of 42 to 48 mm, including common binocular models such as 10x42 and 8x50 and many telescope eyepieces. Easy to install and remove: stretchon design slips over the eyepiece without tools and stays in place during normal use. Durable material: resilient rubber resists deformation and holds shape through repeated mounting and removal. Specifications Quantity: 2 eyecups Fit range: 42 to 48 mm eyepiece diameter Material: soft, flexible rubber Intended use: adult microscopes accessories kit and eyepiece protection for binoculars and telescopes How to use 1. Clean the eyepiece surface and ensure it is dry. 2. Stretch the rubber cup gently and slide it over the eyepiece barrel until it seats against the eyepiece rim. 3. Adjust position for comfortable eye relief. Remove by stretching and pulling back. Care and maintenance Wipe with a damp cloth and mild soap if needed. Avoid solvents or abrasive cleaners. Store flat or mounted to prevent unnecessary stretching. Practical applications Birdwatching: install on 10x42 or 8x50 binoculars to reduce side glare during daytime observation. Stargazing: use with telescope eyepieces to create a stable viewing aperture and improve perceived contrast under dark skies. Laboratory or classroom microscopy: use as an accessory for adult microscopes with compatible eyepiece diameters to provide a repeatable eyepiece contact point. This simple replacement kit provides a practical, loweffort way to restore comfort and functionality to eyepieces that accept 42 to 48 mm rubber eye cups.