There are two main different types of this type of racking: Double-Armed and Single-Armed. There are also 3 different sizes of arms that you can opt to get which are: Extra Heavy-Duty, Heavy Duty, and finally Standard Arms. Each of these are different sizes and capacities making this type of rack more personal for each type of customer. Making sure that each of these cantilever racks are customizes for our consumer is our goal. Each arm has a capacity of up to 6,000 pounds. Double-sided column capacity you are look up to 85,000 pounds and for the single-sided column up to 42,000pounds.