CBK 200mm Nodal Rail Slide Plate QR Clamp Macro Panoramic Bracket For Arca Swiss RRS Multi-Purpose Rail Nodal Slide Dual Dovetails Clamp is widely used in Panoramic and Macro Photo shot, it support Arca Swiss Double Dovetail allows you to mount the rail to an Arca clamp and combine with a bi-directional clamp for incredible versatility. The most important function of this product is the option to accurately find nodal point in panoramic photography, which can realize the maximization of seamless stitching of panoramic photography; In close-up photography, you can slide the camera in and out without moving the tripod. Ideal for Close-up and Panoramic photography. With 39mm standard AS interface, compatible with RRS / ARCA-SWISS / KIRK / Wimberley / MARKINS / SUNWAYFOTO / kangrinpoche / BENRO / SIRUI ball head of AS standard Interface. Note: the item can not fit Level-Release System of RRS / Markins / Vanguard and other brands