Review on Pack of 100pcs uxcell M3x5mm(L)-5.4mm(OD) Metric Threaded Brass Knurl Round Insert Nuts for Enhanced SEO by Wayne Gilbert

Haven't had a chance to use them yet but first impression they are quite well made. I checked the threads with a couple of screws I had and they are nice and smooth. All parts appeared to be well made, there were no obvious defects and they looked consistent. I haven't played around with a caliper to check tolerances, it's just not that important for my application. Overall, I'm very happy with the quality of these earbuds, and for less than $4 for a pack of 100, you can't go wrong.