The Hillman Group 2511 1/4-20 x 5/16 x 3/4 Inch Brad Hole Tee Nut, 13-Pack

I used nine of these for mounting casters on the trundle bed I built. I was a little surprised at how small they were, because the image makes them look so much bigger, the brad holes especially. But they mounted fine and the casters screwed into them fine and they seem to be holding up fine. So I have no problem with them at all. I ended up using screw nails for mounting them to the frame. Hopefully they never come out. I feel pretty confident they'll last at least as long as the bed will.

Thanks to who ever corrected my order. I did a lot of reasearch and measuring to learn that these T-Nuts were the answer to getting my project just right. Amazon delivered my order to someone elses house and, I needed these T-Nuts really bad. All is forgiven because these nuts are perfect. The other choice I was looking at before I found these nuts were going to cost me $7.85 each and, I needed 24 of them. I almost paid $188.40, plus Taxes and shipping for those nuts and that would have made me a real NUT.

Amazing what you can use to get a job done. I used this to restore a rear automotive wing from the 80's

These did not fit the application where I wanted to use them.Not that the parts are bad. They are fine as designed, but I had misunderstood the dimensions and thought it was larger base. I would be concerned about the small surface and just brad holes to secure this in place. The legs should be short and not be dragged or this could break out of the mounting.

These work great. Solved my problem exactly. Strong and fit the screws well. Exactly as shown