Our best snap-plug terminals for preventing wire pullout and loose connections. A combination of crimping and heating makes the wire extra rigid and secure. First, squeeze the barrel evenly and tightly onto the wire with a crimping tool so it stays put when tugged, vibrated, or under tension for long periods. When you apply heat, the plastic seals and grips the stranded wire while the enclosed solder melts it into a solid, rigid wire that's even tougher to twist or bend. With a round tab rather than a flat one, these are a space-saving alternative to quick-disconnect terminals.