Review on POWERTEC 4 Inch 20 2 Inch QTB1005 T Slot: A Revolutionary, High-Quality Power Tool Accessory! by Jerardo Phi

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.