The TFC Xtender Radiator Shroud was designed to increase the air flow performance of a fan. The Xtender"s tunnel principle holds the air during its rotation inside and improves the air flow through a radiator. The air can not escape and is forced to use the path towards the radiator. Directly behind the middle of the fan"s impeller is no airflow, called a dead spot, but air turbulence is needed to pick up the heat from the heat source. By using the XTENDER Shroud, the air turbulence is increased within this tunnel and a dead spot is avoided, increasing performance for your radiator. Includes 1 x Silicon Pad, 4 x M3/65mm Screws, 4 x M4/65mm Screws, and 16 x Clear PVC Washers. Made from clear acrylic. Dimensions: 120 x 120 x 31mm. Made in Germany.