Easy To Install: Simply tighten the screw clockwise to securely install the ball base to the fork stem tube. The 1'' ball mounting base designed to fit into the cylindrical or hexagonal bore wall of motorcycle fork stems. The ball base come with 2 metal expansion spacers, small size expansion spfit for fork stem tubes 12mm to 18.5 mm in diameter, large size expansion spfit for tubes 18.5 mm to 25.4 mm in diameter
PRE-INSTALL CHECK: Measure tube diameter, select and fit the correct spbefore installing the ball base. Support minimum tube depth 38mm
Adjustable Length: By adjusting the telescopic rod at the bottom of the mobile phone holder, you can match mobile phones of different lengths. After completing the length adjustment, lock the bottom switch