YUYIKES Aluminum Bike Bicycle Handlebar Extension Adapter for GoPro HD Hero 3 2 1 Material: Aluminum,it's much more practical and durable for long term use Precise design eliminates common shaking in plastic mounts,it's much more stable Fits handle bar about 30-32mm Compatible with GoPro HD Hero 2 Hero 3 Hero 3+ Made of 100% CNC machined aluminum, good durability. Just remove the two bolts with the included hex key and attach to your handlebar. Eliminates vibrations from filming. It is a perfect accessory for mounting your Hero 1/2/3/3+ Package included: 1 * Bar Adapter 1 * Hex Key