Review on 🔩 HVAZI Mixed Zinc Plated Carbon Steel Rivet Nut Assortment Kit - #8-32UNC, #10-24UNC, 1/4"-20UNC, 5/16"-18UNC, 3/8"-16UNC, 1/2"-13UNC - Threaded Flat Head Insert Nutsert - Rivet Nut Set by David Diaz

These inserts are of good quality, including the box that contains them. I wish there were a few more sizes but they clearly state the combination of sizes so it was exactly what I expected. My only minor concern is that I believe the materials they are made of may have been metric sizes and not SAE. The internal thread was just perfect (and SAE as advertised). However, I ended up using metric drill bits to make holes suitable for inserting these things (for the required fit). This was especially true for the largest inserts (0.5"). No complaints though, they worked fine in all sizes I've used (1/2", 3/8" and 1/4").