ThePhoenix FPS58 fixed passenger stair is designed to service commuter aircraft with a 58 inch doorsill height. The stair is constructed with structural steel tubing. The stair treads are made of steel sheetmetal. There is an adjustable wing with a positive detent and aircraft bumper. The front bumper is a 4-1/2 soft rubber bumper and covers the entire front of the platform. The stair treads and platform are painted with a polyurethane paint with non-skid additive. The unit has 7” casters (2) fixed in front and (2) swivel in the back. The rear casters pivot down and allow the stair to sit firmly on the ground to stabilize the unit for passenger use.