Rail node slip plate 200 mm Quick Release QR Clamp for macro photography Multi-purpose double swallow tail rail knot clamp is widely used in panoramic and makro photos, also suitable for Arca Swiss. Standard design with two swallow tails, with built-in high contrast level to improve alignment. Scale on both sides of the rail to conveniently and accurately set the punkt node. It is widely used with fish eye lenses and wide angle lenses. The clamp with knob helps to lock the equipment quickly. With standard AS 39 mm interface, compatible with RRS / ARCA-SWISS / KIRK / Wimberley / MARKINS / SUNWAYFOTO / kangrinpoche / BENRO / SIRUI ball head of standard AS interface. Specifications: Material: Aluminum Alloy Black kolor Thread: UNC 1/4 "-20 The jaw can be opened from 39 mm to 45 mm Length: 200mm Width: 38mm Height (without jaws): 15mm The package includes: 1 piece 200mm knot slip plate makro rail clamp