BRCOVAN Metal Motorcycle Fork Stem Mount Base with 17mm TPU Ball for Stems 12mm to 25.4mm in Diameter, Compatible Motorcycle Bike Phone Mount Holder with 17mm Ball Socket

The ball base designed to fit into the cylindrical or hexagonal bore wall of motorcycle fork stems. Suitable for stem tube holes 12mm to 25.4mm in diameter. Package comes with two sizes of metal spacers. Small size spacer fit for tube 12mm to 18.5mm in diameter, Large size spacer fit for tube 18.5mm to 25.4mm in diameter. You can choose one size of the spacers according to the tube diameter for installation. It is not supported to use two spacers of different size at the same time. The metal motorcycle fork stem base included 17mm TPU ball works for motorcycle phone mount & bike phone holder with 17mm ball socket. PRE-INSTALL CHECK: Measure tube diameter, select and fit the correct spacer before installing the ball base. Support minimum tube depth 38mm. EASY TO INSTALL: After select and fit the correct spacer, install the ball base. Step 1, insert the aluminum alloy round plate base into the motorcycle fork stem tube. Step 2, use the Allen Wrench included with the package to tighten the bolt of the round plate base. Step 3, install the 17mm ball base to the aluminum alloy round plate base. Installation complete