Sturdy: ABS plastic housing, durable, designed for safe use, rear cover insulates the terminals against short circuits, equipped with 4 sets of bolts. Operation: On/Off 2 positions, 275A continuous at DC 12V, 455A intermittent at DC 12V, 1250A momentary at DC 12V. Compatible: Used for DC 12-48V systems to isolate and secure the electrical system, can stand-alone or interlocked with other switches. Usage: Eliminates any battery power consumption when the vehicle or boat is not in use, safely disconnects the battery. Copper bolt size: 10mm x 2 , very easy to install, universal use for cars, vehicles, RVs and boats, also for electrical appliance switches.< /p>