A family-owned marine manufacturer and service shop in Sparrows Point, Maryland, Miller's Island Propeller makes and reconditions boat propellers while supplying the underwater hardware and shafting that keep vessels moving. Founded in 1971 as a foundry and propeller reconditioner, the company now operates a 55,000-square-foot manufacturing and warehouse facility with rail service. It is also the largest distributor of sailboat propellers in the United States and produces its own Chesapeake 3 sailing propellers.