Heavy-Duty: ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short of circuits, equipped with 4 sets of bolts. Operation: On/Off 2 positions, 275 Amp continuous at DC 12-Volt, 455 Amp intermittent at DC 12-Volt, 1250 Amp momentary at DC 12-Volt. Compatible: used for DC 12-Volt to 48-Volt systems to isolate and secure the electrical system, can stand alone or be locked together with other switch. Its purpose is to eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. Widely used for car, marine boat, RV, camper, travel trailer, truck, ATV, UTV, battery banks and other devices. Package include: 1X On/Off battery switch,4 bolts included.