Features: Helmets mount adjustable arm, suitable for the curved-surface of bike, motorcycle, bicycles and rock-climbing helmets and others. Made of aviation aluminum-alloy, solid and full of durability. High-end anodic sandblasting and oxidation, comfortable feel, and not easy to fade. Multi-angle adjustment, you can adjust your desired angle according to your require. It can be tightened with hex-wrench and not easy to loosen. Specifications: Material: Aluminium-alloy Size: about 12x2.5cm/4.72x0.98inch Processing Technology: CNC-processing Surface-treatment: Anodizing Applicable Models: for Hero 10 9 8 Max 7 6 all series, EK70004K, 360 ONE R Action Cameras Note: Please allow 0-1cm error due to manual measurement. Please allow for slight color difference due to different monitor resolution. Package includes: 1x Three-way Adjusting Arm 1x L-shaped Wrench