read the OWNER'S MANUAL.. all tCs have it and if they don't have it, it means they bumper was probably replaced somehow. the circle is where the towing thingermajigger goes. When u need to be towed by one of those crane type towtrucks, you need to remove the circle and screw in the towing harness for the tow truck to hook onto. If u dont know this with a crane type towtruck, he'll just rip off your bumper or something worse. again... try reading your owners manual!