Very well made step rails designed especially for the Frontier King cab. If you have an older second gen Frontier, the secret is to carefully chase the threads on the factory running board studs. Once the stud threads are chased of rust, dirt and grime, installing the step rails is easy. Be careful to obey the faster torque specs set out in the instructions - otherwise you could snap a stud. They look great and make for easy entrance and exit for your Frontier and protect against door dings and dirt / splashes.