Aluminum Thumb Screw attaches to your GoPro style interface bicycle mount, providing more adjustment and gripping leverage for your action camera or light. Features a built in 4mm hex-key fixing bolt for locked in place set up. CNC machined 6061 T-6 Aluminum. Compatibility with Combo Mounts or Light and Camera Mounts. Lifetime Warranty. Made in USA. Tightens or loosens connection between GoPro Mount and Camera or light. Weight: 10g.