Review on 🔩 Te-Co 41406T Black Oxide 1018 Steel Tapped T-Slot Nut, 3/8"-16 TPI, 5/8" Height x 7/8" Width x 9/16" Table Slot (Pack of 5) by Noe Spooner

I bought them for the 2015 tundra railway system. Others have reported that they work and appear to be, with some limitations. First, they aren't high enough to fully hook behind the handrail. If you overtighten them, the top edge will start to come out. Second, you need to be sure you don't attach it to the notches cut into the rail system or it will definitely slip through and not attach properly. I would be happier with a big shouldered t-slot nut as it would fully engage the rail with no risk of pulling or warping.