3 Steps, 4' High, Type IA Rating, Fiberglass Step Ladder. 300 Lb Capacity, 19-9/16" Base Width. Type IA ladders hold a load capacity of up to 350 pounds. This includes the user, plus materials. It is considered extra heavy duty and can be typically used for roofing, building, maintenance, general contracting and industrial applications.Fiberglass is a strong, durable professional grade material that s non-conductive. It has electrical and weather resistant properties and is ideal for heavy duty construction