Zipp quickview tt garmin gpscomputer mount size 223mm colour black quarter turntwistlock zipp delivers an uncomplicated computer mount for aero bar extensions thats easy to install lightweight and vibration and slip free the 223mm industry standard quarter twist mount installs simply and securely on aero extensions aerodynamically shaped for left side installation but also can be installed on the right bar extension comes with single torx t25 bolt flexible mounting clamp and twist mou