Our patent-pending integrated mount for the ELEMNT ROAM 2 GPS bike computer is made of durable, lightweight plastic. It also comes with an optional locking screw that is UCI compliant for connecting your ELEMENT ROAM 2 to your bike for weigh-ins. Fits 31.8mm round bars Weight: 1.55 oz (44g) Works exclusively with ELEMNT ROAM 1 and 2