These appear to be very well made 3/16" quick connectors for .020" (0.5mm) thick tubing. The contact interface has sufficient coverage, the contacts are well formed into double round springy curls, and the flat area is properly divided and embossed into contact holding areas, the material has good resilience, the contacts achieve good normal force (surface pressure) for low contact resistance , no scraping of plating Crimp ferrule is the correct size for 16-14 AWG stranded wire, is round, has…