It is for changing the direction of the ratchet, though note it is only designed to torque in forward as per the manual. I personally wouldn't recommends using it in reverse like a breaker bar as it can mess with the calibration but it you are dealing with something not torqued too much it should be fine and saves you the time of switching to a ratchet. Sorry about the delay, I've really let this channel go lately but hopefully I'll get it up an running again properly soon.

Just bought this for 25€. I believe it will be good to torque the wheels and maybe some suspension work :)