The Door Bars are a bolt-on horizontal brace to prevent sag on convertible vehicles while mounted to your AutoTwirler or AutoTwirler Plus. Door Bars have swivel necks attached to the mounting plates to allow attachment at any accessible area. They generally attach at the striker and hinge plates but can also attach to seat belt mounts and hinge plates. Designed on a U joint to pivot at any angle. Door Bars may also be used for vehicles that are structurally questionable while mounted to the AutoTwirler. Check the width of your door opening for attachment options. Adjusts from 44″ to 62″ Long.