Provide quick, secure connections. Tough thermoplastic shell shields against environmental extremes. High dielectric shell features a deep skirt design to prevent exposure of bare wire while providing superior flash-over protection. Comply with Federal specification W-5-610d and are UL (Underwriter' Laboratories) 486C listed and CSA (Canadian Standards Association) certified. Contains 2 each No. 19-001 gray, 2 each No. 19-003 orange, 3 each No. 19-004 yellow, and 2 each No. 19-006 red. 300V/600V.