The handlebar clamp mount made of 6061-T6 aluminum alloy material for durability and reliability in the most demanding environments. Aluminum alloy tough-claw are lined with TPU pads to provide a stable grip and protection of the mounting surface. Quick Mount is designed to quickly clamp round or square rails from 0.5" to 2" diameter. This handlebar clamp base has a 17mm diameter ball joint for devices with a 17mm swivel ball mount pattern. Please note that it does not apply to B size 1" ball socket systems.