These are high-grade industry standard solenoids. Typically used to operate a winch for two-way (i.e in and out) use. Supplied with a wiring diagram.
Contact rating: 12VDC
Power: 4000W max.
High Current Contacts: 5/16inch Studs
Solenoid contacts: 1/4inch QC tabs
Dimensions: 130mm (L) x 110mm (H) x 70mm (W)