Specifically designed for a positive clamp to the polymer receiver of the SU16 rifles with a long 1.3" clamping surface. 1" low mount rings. Fits Kel-Tec SU-16 rifles and PLR-16 pistolsFor Picatinny rails. Separate clamping screws for rail & scope. Black anodized 6061 aluminum. Includes 2 scope rings & hardware.