Simplify your bike setup and optimize the height of your Varia rearview radar to ensure you're visible to oncoming drivers. This optional mounting kit allows cyclists to mount and install the compatible Varia device under the bike saddle on standard seat posts. Installation is simple with a 4mm hex wrench (not included). For saddles with carbon rails/sleds, we recommend tightening the bolts with a torque wrench to a maximum of 4 Nm.