Butler Creek Element Scope Cap Black Objective 40mmButler Creek Element Scope Cap Black Objective 40mm Fits scopes with a 35 40mm objective lens; Heavy polymer cap, rubber housing and steel hardware; Flex fit sleeve creates watertight and airtight seal; Black and clear inserts allow customization between solid, see thru or data disk; Open vertical or lock down flat for unobstructed view Item Category Code: 4000 Product Group Code: 4000C Product Sub Group 1: 4000C3 Inactive: No