Works for: For single 8inch, 10 inch, 12 inch, 14 inch, 16 inch Fans(2 x 8 inch Fans, 2 x 10 Inch Fans, 2 x 12 Inch Fans, 2 x 14 Inch Fans) To turn electric fan on at 185 degrees and shut off at 165 degrees 12 volt Electric Fan Wiring Harness, Relay, Sending Unit & Circuit Breaker 12V The 40 Amp Relay Helps take the Load & Aids in Starting the Fan with less Amps Also includes an Overload Circuit Breaker Includes the Relay Wiring Harness with 350cm of Wire.Also included is an assortment of wiring connectors to help aid in installation Product Name: Electric Fan Wiring Harness Kit Working Voltage: 12V Notice: Professional installation is highly recommended (No Instruction Included) colour:As shown Material:Plastic + Metal Package Contents: 1 x Thermostat Switch 1 x Relay Wire Harness 1 x 3/8inch NPT Thread-In Probe 1 x In-line Fuse Holder 2 x Ring Terminals 2 x Fan Pigtail Connectors 1 x 3/8inch to 1/2inch Adapter 1 x 40 amp Fuses Only the above package content, other products are not