Made of aluminum , it is compatible with various optics such as T1, T2, H1, H2, RomeO and CompM5. The backup iron sight (BUIS) in the mount is a really great idea. You can adjust the sights to move it left and right. Easy to hold zero. Features & details Widely Compatible：Compatible with H1, H2, T1, T2, CompM5 and other optical sights. Note: Not fit COMP M5S and M5B. Quicker Sight: Micro red dot riser mounts up at 2.26 " making it easier to shoot .The riser mounts provide shooters with a rapid sight picture. Multifunctional Design: BUIS in the mount is a really great idea. The Picatinny riser mounts contain both a front and rear sight for a complete aiming option that keep your Picatinny rail uncluttered. High Quality Material: Scope riser mount is made from aluminum. Lightweight and more comfortable. Easy to install: Red dot riser mount has greater stability. Allowing you to aim quickly while moving.