Semi-Trailer Access Ladders are for use getting into Semi-Trailers. Tilt the unit to allow for portability. Units roll on 4" poly-on-poly wheels. Constructed of square tubing framework which handles uniform capacities up to 350 lbs. Features 30" high removable hand railing, access chain, 21" deep top platform, and an industrial baked-in blue powder coat finish for toughness. Each step measures 24" wide by 7" deep and is spaced 10" apart. Climb Angle is 58 degrees.