Feature:1. Interlocking Design: The male and female slot interlock design at the edge of each socket makes it easy to connect all relays together.2. Includes 5Pcs Relay: There are 5pcs 12V 30A automotive relay in the set, and the large quantity will meet your needs for replacement.3. Perfect in Matching: Suits perfectly for split charging or any vehicle requiring high power relay, ensuring wide range of application.4. Good ABS and Copper: Consisting of premium ABS and copper material, not likely to malfunction, and very durable for long term using.5. Simple Installation: Comes with a light weight and a compact size as well, the car relay allows for convenient installation in minutes.Specification:Item Type: Automotive RelayProduct Model: JD1912Material: ABS, copper. Contact Type: Normally OpenOutgoing End: Wide foot plug in type. Pins: 4 PinCoil Voltage: 12V DCCurrent: 30A.Package List:5 xAutomotive RelayNote:Large capacity and high currentcarrying capacity, heavy load on off relay. But never exceed its ability to keep the interest rate below 10% to 15%.