Abstract: A roll formed step rail for a vehicle comprises an elongated rail body having two opposing edges which define a longitudinal channel. The channel receives a pinch clamp which is wider than the channel and has a fastening hole and an alignment means. The rail body is lowered onto the mounting surface of a mounting bracket adapted for rigid connection to a vehicle. The mounting surface defines another fastening hole and another portion of the alignment means. A fastener draws the pinch clamp and the mounting surface toward opposite sides of the opposing edges of the rail body. Because the pinch clamp spans the width of the channel and is aligned properly relative to the mounting surface, the rail body is secured between the clamp and the mounting surface by the tightened fastener.

Abstract: An extension ladder, including multiple ladder sections, each including a pair of pin holes, a pair of columns, and a rung, including a pair of pins, a pair of springs, a gear, a pair of gear racks, and a pair of mounting rings, wherein the columns of adjacent ladder sections are fit with each other, diameters of the columns of the ladder sections increase from the top to the bottom, the pin holes are disposed on the columns, and operate to receive the pins, the pins are coaxial, the gear is disposed on a side wall of the rung and engaged with the gear rack, one end surface of the gear sticks out from the side wall of the rung, a key hole is disposed on the end surface of the gear, the mounting ring operates to fix the pin, and the spring is contacted with the pin.