Flip it. Protect it. The VortexA(R) Defender Flip Cap Objective Lens 40 features a snap-flat spring that won't obstruct your line of sight. Fits securely on nearly all optics with an outside diameter of 45.5-48.5mm. Flexible rubber sleeve creates a snug fit over scope Smooth flip-up, easy to clip back down Snap-flat spring won't obstruct your line of sight Dual opening tabs for easy access Order today!