Provide a safe way to extend vertical reach. Ladders roll on spring loaded, retractable swivel casters which permit four rubber-tipped feet to grip the floor when the ladder is stepped on. Made of welded tubular steel with three expanded steel steps. Width: 20-1/2" at base. Conforms to OSHA 1910-29. Height: 28-3/4". Weight: 26 lbs.