Description: These are heavy duty SPST 30A relays. 4 Pin 4 Wires Harness Socket. 24 30 amp 4-prong relays. This kit can be used to install electric cooling fans, Electric fuel pumps, Electric water Pumps, Shaved door handles solenoids, Trunk solenoids, Horns,alarms, horn, headlight and so on Specification: Material: Plastic and Metal Rated voltage: DC24V Rated current: 30A Relay socket size: Approx 35mm*20mm*15mm Contact load: 14VDC 30A Coil resistance: 340(1��10%)�� Life Expectancy Electrical: 100,000 Ops Life Expectancy Mechanical: 10,000,000 Ops Package Includes: 3 Pieces 4 Pin Relays(2 Pack) Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making payment. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.