Black Insulated In-Line Splice 600 - 4 - Marked Insulated Splice for easy identification.Features Insulated splice with rugged high-dielectric rubber/vinyl coating Pre-filled with oxide inhibitor. Insulated splice provides easy re-entry for changes inspection or troubleshooting. Plugs marked with connector max wire size for easy identification. 6061 aluminum dual rated for use with copper and/or aluminum wires. UL/CSA certified through 600MCM size. Rated 90°C 600 Volt. One wire per terminal.Specification Wire Range: 500 - 4 Allen Hex: 5/16 in. Length: 5.63 in. Width: 1.50 in. Height: 3.00 in. Item weight: 0.7563 lbs. - SKU: MSPR106.