What You Get:You will receive 2 pcs heavy duty 4-pin SPST relay and the accessory terminals included.12V DC switch relay, 100A large current carrying capacity, to ensure the use of electricity more secure Quality:This relay consists of nylon flame retardant shell and pure copper inner core.Quality material and strong electric conductivity Efficient:Internal use of pure copper coil, conductive performance is strong, low loss rate Easy Installation:Insert DC 12V power supply, regardless of positive and negative poles The heavy duty car starter relay is with wide application, used for small crane, wheat combine harvester, auto start power switch, auto preheat relay