Camburg 17-20 Ford Raptor/ 15-24 F-150 TIG 4130 Shackles (stock length)Looking for the best? Our Camburg TIG shackles replace the stock light duty version on your F 150. The stock shackles are stamped out of thin metal and use a rubber bushing which both allow for a flexy component that also binds as it cycles since the rubber bushings are vulcanized into the shackle. Our TIG shackles are a fabricated boxed gusseted design from 4130 chromoly that is much stronger than mild steel and use polyurethane bushings that pivot