Features: A great photography accessory for panoramic photography and close-up photography.  Made of high quality aluminum alloy, CNC precision machining, surface anode anti-oxidation treatment.  Built-in bubble level and precision ruler make your photography more precise.  Equipped with 1/4" to 3/8" adapter screw, the width of the dovetail groove in the bottom is approx. 20mm.  Adopts for Arca Swiss standard, compatible for Arca Swiss standard quick release plate, such as for RSS, for Arca-Swiss, for Kirk, for Wimberley, for Markins, for Sirui, for SUNWAYFOTO, for Benro, etc.   Specifications: Material: Aluminum alloy;  Color: Matt black;  Screw Interface: UNC1/4" & UNC3/8";  Slot Width: 38mm-45mm;  Compatible Quick Release Plate: For Arca Swiss standard all quick release plates;  Item Weight: 8.8 * 5.1 * 1.5cm / 3.5 * 2 * 0.6in (L * W * T);  Item Weight: 61g / 2.1oz;  Package Size: 10 * 6 * 3cm / 3.9 * 2.4 * 1.2in;  Package Weight: 77g / 2.7oz;   Package List: 1 * Quick Release Clamp