GB WireGard wire connectors make quick, secure connections for positive continuity. Their tough, thermoplastic shell shields against environmental extremes. The color-coded high dielectric shell features a deep skirt design to prevent exposure of bare wire while providing superior flash-over protection. Splices copper-to-copper. GB connectors comply with Federal Specification W-5-610d and are UL (Underwriter's Laboratories) 486C listed and CSA (Canadian Standards Association) certified. Threads wire immediately. Firm-grip surface. UL listed.