Caution: Please limit the load within 22.0 lbs (10 kg). Mountable diameter: 1.0 - 1.3 inches (25.4 - 32 mm). Different bicycles have different mounting anglesTest and install firmly in place to reach the most robust condition. For use as a cargo carrier only, do not use as a two-seater vehicle. Package Contents: Aluminum bicycle rear seat post x 1, Allen key x 1, 0.2 inch (5 mm) required for installation.