Very nice deck passage with water guard. Made of high quality stainless steel VA4 absolutely stainless and UV and seawater resistant. The deck passage is similar to a gooseneck designed, but has two mounting points with 3 holes, so that the overall design is much more stable. In addition, the deck passage has welded a bracket on which you can tie down ropes. Length: 21.5 cm Width: 70 mm (diameter base plate) Outer diameter (pipe): 32 mm Inner diameter (pipe): 28 mm Height: 17 cm Thickness of plate fittings: 4 mm Hole diameter: 8 mm