Stainless Steel Side Mount Rod Holder Solid stainless polished side and transom Rod Holder has a sleek 20 degree swept back style and include a heavy vinyl liner, and an interior bottom pin prevent spinning of rod. It is 9 3/4 inches long top to bottom made to flat mount to transom or wall. Mount them vertically or at a laid out angle to get your rod tips more outboard. The outside diameter is 2" and inside diameter is 1-3/4". This stainless polished rod holder is used in some Boston Whalers.