Description: Multi-Purpose Rail Nodal Slide Dual Dovetails Clamp is widely used in Panoramic and Macro Photo shot, it support for 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. Features: CNC machined from light weight aircraft-grade aluminum, sealing it against corrosion and abrasion, has two safety stop screw on back of plate Standard dual dovetail design, with high contrast built-in bubble level to improve alignment Scale on both sides of the rail to adjust the nodal point conveniently and accurately. Clamp with screw-knob help you locking equipment quickly. Designed with 10pcs UNC1/4 screw thread for extended function. Accurately find nodal point for panoramic photography. It is widely used with fish-eye-lenses and wide-angle lenses. Safety stop relief grooves for protecting your camera from accidental drops. Specification: Model: NNR-200 Material: Aircraft Aluminum alloy Color: Black Screw Thread: UNC 1/4"-20 Jaw can be opened from 39mm to 45mm Length: 200mm Width: 38mm Height (not inc jaws): 15mm Fit for PU-50/PU-60/PU-70/PU-100/PU-120/PU-150/PU-200 Package include: 1 x Multi-Purpose 200mm Nodal Slide Plate Macro Rail Clamp Note: 1. The item can not fit Level-Release System of RRS / Markins / Vanguard and other brands. 2. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .