Nylon insulated butt splices are higher quality wire connectors used to extend, repair, or change an electrical circuit and come in 3 sizes - 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. Our nylon butt splices are also manufactured in the USA.