This called DUT(device under testing) which is adhered with many sockets to test large volumes of semiconductor devices. This board is used in high temperature, in order to check for defects, by attaching the device to the board in a chamber, where it has a constant temperature over 125°C.
[unit : mm]
Conductor width 0.15
Conductor space 0.15
Hole dia ø0.5
Surface Treatment Electroless gold plating
To burn in test semiconductor products.