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Edson's offers both Single and Double Hub Sprockets for Sailboat Steering Systems. When space is limited, use these non-magnetic Brass and Bronze sprockets with hubs on one side. These sprockets accept American Standard Roller Chains (Edson #630). Use double hub sprockets when space will allow; their extra length will spread the load. They are the same as the single hub sprockets but have a hub on both sides of the sprocket teeth with one side knurled for a brake. The Double Hub Sprocket is the standard sprocket used in Edson Pedestals.