Relations Feature A Made of Aluminum Alloy 6061-T6, 3 Positions: Close, Full Open and Flip-Down A For Vector Optics Continental 5-30x56FFP & 4-24x56FFP Scope Objective Lens, A Fit Any Scope Objective Lens with M57.5X0.75mm Connection Thread Code A Accept OEM and ODM Orders for Different Lens Size and Thread Code Specification A Flipped Position: Close, full open and flip-down A Connection Thread Code: M57.5x0.75mm A Material: Aluminum alloy 6061-T6 A Finish: Black matte A Weight: 45g / 1.6oz A Easy to Use, screw into the scope objective lens A 360 degree rotation that you can set the cap in different position