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-alloySize: about 12x2.5cm/4.72x0.98inchProcessing Technology: CNC-processingSurface-treatment: AnodizingApplicable 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 Arm1x L-shaped Wrench