Features: 100% brand new and high quality Compatibility: This bike ventilated helmet mount accessories Kit for all the go pro lovers. Compatible with Go Pro10/9/8/7/6/5/OsmoAction/Insta 360 ONE R action camera and More. Easy to use: After the rope strap passes through the helmet, it can be fixed by pressing the lock button. Lock Buckle: With two adjustment buckles, you can adjust the strap's length. it is quick release and quick installation design. First-person Video: you can install a camera on the helmet and shooting beautiful scenery during sports such as cycling, skydiving, gliding, skiing, etc. Wide Application: It also can be installed on various objects such as motorcycles, car roofs, surfboards and so on. Package Includes: 2 Package Optional: Package 1 Include: 1x Helmet Strap 1x Adapter 1x Long Screw Package 2 Include: 1x Helmet Strap 1x Extension Arm 1x Adapter 1x Long Screw Specifications: Material: Nylon, Aluminum Alloy Color: Black Type: Helmet Strap A/Helmet Strap and Extension Arm B Applicable Model: Compatible with Go Pro10/9/8/7/6/5/OsmoAction/Insta 360 ONE R ActionCamera Helmet Strap: Approx. 34.5x4.6 cm/ 13.58x1.81 inches Adapter: Approx. 4.6x3.2x4 cm/ 1.81x1.26x1.57 inches Long Screw: Approx. 5.5x1.5 cm/ 2.17x0.59 inches Extension Arm: Approx. 16.5x1.6x cm/ 6.5x0.63 note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.