These same airplane sights are made of polymer that fold up or down with sharp precision so your sights stay where you want them. The front sight has an adjustable A2 post with a spring-loaded locking design that automatically locks into place to ensure zero when raised. The rear sight is adjustable for windage and has two openings. Don't be without your sights if your optics fail. Zero in on near or far with your tumbling American tactical sights today! - Polymer - Same flat level for receivers and rails - Adjustable A2 front sight post - 2 adjustable rear sight openings for windage