Butler Creek Tactical One-Piece Objective Scope Cover, Size 30-31 (1.960-1.998-Inch, 49.8-50.7mm) Tactical flip up caps Protect your expensive optics from dust Unique one piece design Provide a clear field of view Unique one-piece living hinge design Flexible lid easily folds up for use Keeps dust, dirt and weather off lens surfaces Built for heavy use and reliable in all weather/temperature conditions Tight, flexible collar provides custom fit for multiple scopes