Sight sits .4375" when folded. CNC Machined from billet aluminum and hardcoat anodized, these High Quality back up iron sights feature an custom same plane aperature, adjustable windage knob, and rugged protective ears. Spring loaded ball bearing locks up on an enlarged surface area, allows this back up iron sight to be deployed in one smooth motion, and stay locked up tight. The locking detent button has a stepped down radius to provide easy operation even in muddy or wet conditions. Made in the U.S.A. Features Custom low profile dual aperture fully protected from accidental damage. Thick rugged pivot ears. A locking detent with double the locking surface, for maximum strength. A lock detent button with stepped down turns, to provide a surface you can grab onto, if your hands are muddy or wet. Made from 6061 aluminum, and mil-spec hard coat anodizing, to stand up to the most extreme conditions. Adjustable windage knob.