Premium Flip up Front Rear Iron Sight Set Dual Diamond Aperture Buis FDE - Black Machined from light weight and durable 6061 aircraft grade Aluminum Diamond shaped A2 style aperture, allowing for quick and accurate target acquisition Secure ball bearing pivot detent locking mechanism,Low profile folding design.Dual Apertures Rear sight Windage adjustable with click knob,Front sight A2 post elevation adjustable Ambidextrous,Non-rust hard anodized finish,Compatible with most Picatinny / Weaver rails