. Driver Side: 20"
. Passenger Side: 18"
. Rear Hatch: 20"
1. My finger is pointing to the locking tab:

2. Press the tab:

3. Slide the arm as shown while continuing to press the tab:

4. Then slide it back by the attachment fitting:

5. And off:

To put them on is just the reverse of the above. The tab will snap into place.