Features: Flexible 17mm Ball Head to 1/4" external thread adapter rod for tripods, selfie sticks, live streaming mounts, phone holders, and action cameras. This 17mm to 1/4" external thread composite ball adapter enhances your mounting setup, designed for seamless integration with industry-standard double ball socket mounting arms. Constructed from plastic and aluminium alloy, this adjustable angles adapter ensures long-term durability and compatibility with all 17mm mounting systems. Ideal for tripods, selfie sticks, live streaming rigs, phone mounts, and action cameras, it particularly suits users requiring flexible device positioning on the move. Available in four lengths: 21cm/32cm/42cm/52cm. Whether navigating city streets or recording live streams, its 360-degree rotation allows effortless device adjustment for optimal viewing angles. Specifications: Component: plastic + aluminum alloy Length: 21cm/32cm/42cm/52cm Ball head diameter: 17mm/0.66in Package Includes: 1pc 1/4 turn 17mm ball head connecting rod note: There might be a bit color distortions due to different computer resolution There might be 1-2cm size errors due to different computer resolution