Roadmaster Baseplate arms 523162-1 Set of 2 EZ Twistlock' Series 'Hidden' Brackets The visible portion of the brackets (the "front arms") can be easily removed when not towing — simply twist the front arms 90° to convert from towed car to road car in seconds! They're virtually invisible — improved aesthetics For both car- and motormome-mounted tow bars Computer-cut, all-steel components for exceptional strength Easy to install.