GM 56 Series were the standard OEM connectors used on 1950-1980 US made vehicles. Brass .250\" Female locks into Female Housing (PICO #1863). Insert stripped wire into terminal, butting insulation up to Conductor Ears of terminal. Crimp Conductor Ears and then wrap Insulation Ears around insulated part of wire. Insert terminal end into Housing until locked in place. Terminal can be removed from Housing by using a thin blade to trip locking tang. Female Housing (PICO #1863) sold separately.