I had these oar locks on my wood boat. If I can make a recommendation, I wouldn't buy them. They are just one more thing to break on a boat when you get an oar hung up, lose a nut, etc. A nice set of Caravelli's (sp?) and UHMW oar lock blocks are the silent, strong way to go. I'm not sure they still make the Caravelli's, perhaps one of the guides on the board can tell you.