Ideal for panoramic and macro photography, the 6061-T6 5.5" LRP-2 Multi-purpose Rail from Kirk Enterprises has an Arca-type quick release with 90-degree mounting options, safety stops, laser-engraved scales and lines, and a built-in level. It has both 1/4"-20 and 3/8"-16 female threads for mounting on a tripod head. Additionally, it has an integrated QD (Quick Disconnect) System made out of stainless steel.