How to Use: 1. The default base is 3/8 screw interface, 2. Available adapter screws on the quick release plate to convert the base to 1/4 screw interface 3. Install the quick release plate under the lens or under the camera 4. The quick release plate is fixed on the head can be used 5. Specific reference to the manual for operation Specification: Item Type: Tripod Ball Head Material: Carbon Fiber, Aluminium Alloy Product Assembly Size: Approx. 233x85.5x230mm/9.2x3.4x9.1in Maximum Load Capacity: Approx. 30lbs/13.6kg Package List: 1 x Tripod Ball Head1 x Quick Release Plate 1 x Instruction Manual Note: All data are measured manually, and there are certain errors in the measurement results.