Spec for B-00K: Material: Aluminum | Color: Black | Safety Lock: Yes | Rotation: 360°| Base Dia.(mm/inches): 29/1.1 | Height (mm/inches): 70/2.8 | Weight (kg/lb): 0.2/0.44 | Max. Load (kg/lb): 10/22.05 Panoramic Photography&Flexible Adjustment: With 360°panorama base, the ball head can be rotated flexibly at different angles to meet different shooting needs including panoramic photography. Independent locking knobs and fine damping mechanism allow photographers adjust shooting angle flexibly in seconds. Stability&Non-slip Design: B-00K aluminum ball head can support camera up to 10KG/22.05lbs with durable material and scientific mechanism. SIRUI advanced locking system, (consisting of base lock, main lock, plate lock and safety lock) offers increased stability and flexible angle adjustment. Anti-slip mats covering on the universal plate are included to prevent cameras from sliding off. Wide Compatibility: B-00K is Arca-swiss compatible. It can be attached to different photographic devices with 1/4" standard screw on the plate and can be connected to tripods and monopods with 3/8” screw hole at the bottom. Precision Adjustment: A 10°graduated scale is included for easy and precise adjustment. A large ergonomic main locking knob is provided for fast and easy angle adjustment.