The Leofoto FDM-02 is a universal accessory rail kit that comes with two mounting systems, making it suitable for a variety of applications. It is primarily designed for rifle sports enthusiasts to mount optics and telemetry equipment, but it can also be used in other industries where a stable and adaptable accessory rail is needed. The kit is 7.87" Long and Weighs 1.14lb. IncludedBPL-200 Long RailLH-22 Ball HeadDDC-38 ClampNP-60S QR Plate