This XS Flip-Up Sight Set is constructed from aluminum, has stainless steel clamps and is hard coat anodized. With milspec dimensions, the sights lock into position and attach to any 1913 Picatinny rail. Functional Lightweight Design - At 3.05oz, the set adds minimal weight to your setup while maximizing utility.The front sight features XS Tritium Stripe front: 0.105" wide front post with vertical tritium stripe and white painted outline for visibility in any light. Rear sight features XS CSAT same plane aperture: CQB situations made easy with notch providing a 7 yard zero, aperture a 100 yard zero, or flip to the large battle aperture, all while maintaining zero.