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. WARNING: This product can expose you to chemicals including DEHP which is known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov -