Butler Creek Multi-Flex Flip-Open Objective Lens Cap 40.9-41.8mm

Butler Creek Multi-Flex Flip-Open Lens Flip Cover 40.9-41.8mm
The new Multi-Flex lens and eyepiece caps from Butler Creek offer you the same great features as the standard flip-open series, but this model line is equipped with a flexible and waterproof plastic housing that is suitable for multiple scope sizes due to its custom fit.

same basic function and design as the standard flip-open series
close-fitting, flexible housing provides custom fit for multiple scopes
water-/air-tight lens/eyepiece protection
caps can be opened silently with a thumb click

Here you can find Butler Creek's guide for measuring diameters correctly: Butler Creek Scope Cover Guide