This kit is designed to allow a wide range of temperature adjustments for your electric fan. A bulb at the end of the capillary tube is designed to probe or be attached to the top or hottest portion of the radiator. The adjustment knob may be used to set a precise temperature desired for fan activation. The mounting bracket is made of brushed stainless steel for great looks and durability. The complete kit includes the thermostat with bracket, wiring and mounting hardware. NOTE: Temperature refers to the temp of the capillary tube, not the coolant temp. Adjustable thermostat specifications: Temperature range in degrees: 32F to 248F. Accuracy in degrees: +/- 7. 3F