a heat sink for coolers is provided . the heat sink contains a heat conductive element , a heat dissipating shell covering over the heat conductive element , and a plurality of heat dissipating fins installed on the heat dissipating shell . the heat conductive element includes a heat conductive plate and a heat conductive block installed at the center thereof . the area of the bottom surface of the heat conductive block is greater than that of the topmost surface thereof . when the lower surface of the heat conductive plate is in contact with a device that needs heat dissipation , the heat conductive block increases the heat conducting volume at the center of the heat conductive plate , so that the heat produced by the device can be released at an optimal rate .