Thule Lockable Knob 527

An accessory for rear mounted bike carriers with frame holders, making these lockable. These are sold as a pack of 4 and come with 2 keys. The keys that came with probably do not match your existing keys assuming you have a Thule product with locks in other places such as where the bike rack mounts to your tow ball. 

If you visit us with your product, we can change the key barrels for you using this "master key". Your locks will need to be in the unlocked position for us to use this tool.