Westin Platinum 4 inch Oval Wheel-to-Wheel Step Bars offer truck owners a commercial-grade quality step surface that spans the length of the vehicle and features a third step area to facilitate access to the truck bed. They feature a unique patent-pending Isolator Bracket that supports the step bar past the truck cab on long bed applications, a feature that competitors do not offer. Without an Isolator Bracket, the step area that extends past the vehicle cab is left unsupported. Additionally, Westin's Isolator Bracket bushings act as a cushion for the natural flexing and independent movement that occurs between the cab and the bed mounts during driving, thus eliminating squeaking. Applications are no-drill and that's just another reason why installers prefer Westin!