Buyers Products Large Folding Step is designed for use on trucks and emergency vehicles and conforms to NFPA specifications. The large 7-1/4 Inch by 6-3/4 Inch step features chrome-plated, die cast construction and stainless steel springs to keep the step firmly open or closed as needed. The chrome-plated finish adds corrosion protection and a custom look. The step conforms to the National Fire Protection Association (NFPA) specifications for use on emergency vehicles and has a larger footprint to accommodate heavy boots and equipment.