FlyingAMZ 4-Pack of Bed Rail Cleat T Slot Nuts to Tie Down Deck Rail for 2007-2018 Toyota Tundra and 2005-2018 Tacoma Bed Deck Rail Accessories,Tie Downs and Cleats, Fits Screws with 3/8-16 Thread.

The whole set was threaded very poorly. I tried three different sets of 3/8-16 threaded screws (different lengths, manufacturers) and none of them would pass through ANY of these T-nuts. I gave this 2 stars instead of one because I found bolts short enough to mount my attachments (3/8-16 3/4"), and they didn't go deep enough to hit the badly threaded parts, so with some headache and struggle I was able to use these for my purposes, but you might not be so lucky...UPDATE: Seller immediately refunded the purchase and made everything right, so I'm updating my review to reflect this. They definitely stand by their warranty.

I'd give fewer stars if I didn't own a tap and die set. The threads got bad about half way through and were deforming the threads on the screws I was using. A quick run through with a tap and they were fine. Also, the hole on one or two wasn't quite straight. It didn't impact their designed purpose, but speaks to the overall quality.Update: They've started rusting after 2 weeks. Not impressed at all.

These t nuts fit the bed rail just fine, however the threads were so poorly machined that I had to re-cut the threads with a 3/8-16 tap myself just to be able to get a bolt to go through.