Cramer Stop Step aluminum ladders are light weight, yet ultra sturdy and built to last. Smooth rolling, weight-activated casters retract when stepped on. Just push it around with a hand or foot, then climb on up. Two to six step models available - with or without handrails. ANSI and OSHA compliant with a heavy duty 300 lb. download rating. Ideal for warehouses, storerooms, stocking areas.