These exterior aluminum stairs/fire escapes were made from aluminum with all stainless steel hardware. The outside guardrail is 42" tall, with a handrail mounted at 36" with an 1 1/2" offset. Balusters are spaced 4". All the pipe is 1 1/4" Scd. 40 I.D. The balusters are 1/2" sq. tubing. These exterior stairs/fire escapes were attached to building to have the least amount of contact with the ground. The top landings are 48" X 48". The stair width is 36" between the handrails. The aluminum bar grating treads are actually 43" wide X 1 1/4" thick. The treads are 11' deep with a 7" rise. These aluminum stairs/fire escapes are maintenance and shovel free. These stairs exceed National Fire Code.We can make these exterior stairs/fire escapes out of steel also. Call us with your measurements for a quote.