Fits:Chevrolet/GMC 2014-2017: Westin™ Platinum 4 Inch Oval Wheel-to-Wheel Nerf Bars provide a step area that extends beyond the cab area of a truck. They feature a longer overall length designed to provide truck bed access. They feature a patent pending isolator bracket design that lives up to the Westin™ standard of quality. The Isolator bracket provides the mounting support that traditional mounting lacks. Without an isolator bracket, applications leave the step area that extends past the vehicle cab unsupported. This makes it a flexible stepping area and does not offer the capacity that Westin™ Wheel-to-Wheel Nerf Bars do. In addition, Westin's isolator bracket bushings act as a cushion for the natural fluctuation and independent movement that occurs between the cab and the bed mounts during driving. The bushings also serve to cushion against squeaking which makes Westin™ Platinum Wheel-to-Wheel Nerf Bars a better product than that of the competition.