The teak definitely helps them to look upscale, but they're a bit crude, actually. The attachments to the rail were stainless u-bolts through stainless steel flat stock. Then the line of screw heads that runs diagonally was a stainless steel square tube (pretty small, to try to keep it from being visible) to help support the seat so that it didn't just split along the grain. I'm also afraid that I can't tell you how well they held up, because we moved to a bigger boat a year or two later. They were a nice addition for a boat of that size. Good luck!