"Fitment: Rear Traction Bar is compatible with 2007-2018 GMC Sierra 1500 4WD, compatible with 2007-2018 Chevy Silverado 1500 4WD Material: Rear Traction Bar is made of steel, Surface powder coating, longer usage time Function: Rear Traction Bar stabilizes the rear axle for enhanced stability, also prevents wheel and axle hop when towing a trailer or driving off-road Feature: Rear Traction Bar reduces chassis flex and tail sway caused by sudden acceleration or heavy loads, and eliminates bed vibration Package: 2 x Rear Traction Bars, Assembly accessories, Mounting with screws