Received the product promptly and was very pleased to find 3-prong T nuts inside the box, but as it turned out, they were the wrong size despite the labeling on the box and in the listing. Instead of 1/4", 20 TPI, they were smaller...the outer diameter of the T nut was 1/4" instead of being correctly sized to accept 1/4" bolts. Maybe it was sized more for 3/16". Returned these and bought a different brand, which did turn out to be the correct size.