These same plane iron sights are machined of durable and lightweight T6 6061 anodized Aircraft grade aluminum for strength and durability. The front sight has an adjustable A2 post and a ball bearing pivot detent with posi-lock design that automatically locks into place to guarantee zero when raised and to prevent unobstructed folding under impact. To fold these iron sights simply press the release button located on the left side of the sight. The rear sight is adjustable for windage and has two Apertures. Great for short and long range shooting.