Red fork terminals are for 22-18 AWG wire and come in a variety of insulation materials. Non-insulated terminals are considered the most economical. They are commonly used where special performance or installation characteristics are not needed. Nylon terminals offer rugged construction and high performance. Nylon insulated fork terminals also protect against stress and high vibration. Vinyl terminals are perfect for use where an insulated barrel is necessary. Vinyl terminals have an insulation sleeve of color-coded PVC. A sleeve that is permanently tapered to the barrel. Heat shrink fork terminals protect against the elements in the harsh environment. They are known for offering the best moisture protection available. The heat shrink terminals possess a heat activated adhesive liner. This liner provides a durable, environmentally sealed connection for wires between 22 AWG - 18 AWG.