Nylon insulated butt splices are higher quality wire connectors used to extend, repair, or change an electrical circuit and come in 5 sizes – 4 gauge, 8 gauge, 22-18 gauge, 16-14 gauge, and 12-10 gauge. The butt splice is made from tinned copper for high conductivity and is wrapped in a semi-transparent nylon insulation that holds up to higher temperatures and crimping better than vinyl insulated butt splices. Nylon butt splices are perfect for use in automotive electrical systems, as well as other electrical applications including marine and higher voltage systems since they are rated for use in splicing wires that can carry up to 600 volts with a temperature rating of 221°F (105°C). The nylon insulation is also color coded depending on the wire size and can be crimped using any standard insulated electrical wire crimper.100 PK Red 22-18 AWG Nylon Wire Butt Connectors Makes Crimping wires fast and easyInsulated Nylon for superior weather resistance100% Pure Copper Cores with tin plating to resist corrosion Transparent Nylon insulation allows for easy inspection of wire connection Available in different gauges and quantities, & combos CLICK HEREPremium Transparent Red Nylon 6/6 InsulationRoHS Compliant & UL ApprovedTemperature: 221°F MADE IN TAIWAN