Review on 🔩 Socell 1/4"-20 Brad Hole Tee Nut: High-Quality Carbon Steel Round Base Screw-in T-Nuts for Furniture Hardware – Flange Insert with Female Thread (20pcs) by Chris Tisdale

I needed several 3/8-16 T-Nuts to hold the handles on a pair of sliding doors. I'm in the back were some of the t-nuts visible so i removed the chem film coating with muriatic acid and etched it in phosphoric acid to get a dark color fit in the 1/2" drill bit 12.5mm) I was surprised because the Specifications clearly state that the shank diameter is 12mm, which is less than 1/2". I measured the shank diameter and found it to be 13mm (0.512"), not 12mm (0.500") as I don't have one Having a set of metric drill bits at my store I built a mandrel and reduced the diameter of the shank by about .020" and then went in a 1/2" hole. So if you don't have metric drills, drills or metal turners in his workshop, he turns these half-nuts and not for you.