They worked very well on my Lund Sport Track mounting rail. They required a bit of grinding to get them fit. It wasn't a deal killer. 30 seconds on my desktop coffee grinder and they worked great. I'm giving 4 stars because I had to "modify" them to make them work. But the advert for these screws didn't say they would work with my Lund ST. So I knew what I was getting at. Very high quality product.
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