3M 3984 16 to 14-Gauge Wire Splice Electrical Connectors, Blue, 50 Per Pack Electrical connectors are one-piece and burr-free Made of annealed electrolytic copper for mechanical strength and maximum conductivity Electro-tin plating guards corrosion Feature angled barrel ends for fast, easy wire insertion from both ends as well as built-in stop for correct wire positioning For use with 16-14 gauge wire