16-14 gauge solder heat-shrink ring terminals, 1/4" stud.
For use in harsh environments, these terminals feature a heat shrink connection that also has an internal sealant. By simply applying heat, you'll also melt a small amount of solder that makes a perfect connection - no crimps required. Also keeps moisture out while ensuring your wire does not pull out of the terminal.
Only heat required to install terminal on wire.