Diamondback 42mm Binocular Lens Caps of 49mm Inner Diameter (Set 2) -

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Diamondback 42mm Binocular Objective Lens Caps (Set of 2) The inner diameter of the cap is 49mm. It fits binoculars with an objective lens outer diameter of 50mm. This set of two Diamondback 42mm binocular objective lens caps has an inner diameter of 49mm. It fits binoculars with an outer diameter of 50mm. It's slightly flexible for a secure fit. The ring on the body prevents the caps from falling off, providing peace of mind when you're out and about.