NSI R16-38V 16-14 Awg Vinyl Insulated Ring 3/8″ Stud, 50 Per Pack
https://testing.nsiindustries.com/product/vinyl-insulated-ring-terminal-for-3-8-stud-and-16-14-awg/
Testing Tin-plated Copper Ring Terminal with Vinyl Insulation for wire termination in applications with 3/8″ Stud and 16-14 AWG