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These rubber microscope eye guards have an inner diameter of 34mm (1.34 inch) mounting size.
The eye guards stretch slightly by 1-2 mm, to fit eyepieces with an outer diameter of approximately 34mm (1.34 inch).
The inner lip (8mm, 0.31 inch) holds the eye guard in place to prevent it from sliding down on the eyepieces.
They are foldable for different applications. One pair of eye guards contains 2 pieces.
Please measure the outer diameter of your eyepiece. Other sizes are available for eyepieces of different outer diameters.