COWEEN Scope Protector White and Yellow Airsoft Lens Protector with 20mm Rail Mount Tactical Scope Lens Cover 4mm Thick Shield Reflex Sight 55mm High for Hunting Shooting COWEEN lens protector provide airsoft BB pellets protection for any red dot or holographic sight scope.Shield cover could be flip down when necessary. Fits on all standard picatinny / weaver / 1913 / 20mm rails. Lens is sturdy with a thickness of 4mm.With higher transparency, there is no distortion in sight. White & Yellow 2 color shield are exchangeable. Tools free locking mount, easily bolt-on or remove.