Steel (14 gauge Galvanneal) is our durable 'standard' metal and is the most commonly purchased. All welded construction.
Aluminum is recommended for moist climates for their durability and rust-resistance. It is made of .080 thick aluminum.
Stainless Steel is recommended for very damp and freezing climates as they are the most rust resistant metal. Made of 14 gauge stainless steel with #4 brushed finish.