Large aluminum heat sinks with heat pipe cores.    11x5 in, and 7x6 in.    I think these are for high-power warehouse / stadium lights.   The LEDs on circuit boards attach to the square copper plates. 
Fair Offer Policy applies
 Radial heat sinks for LED lights (Bryant)
Collection Times
Between 9 and 6pm
  Between 9 and 6pm
                                This offer has been gifted to someone and is no longer available.