This is a Double-Side PCB Circuit Board, Each PCB board has 20 pins.
A side for pin pitch size 0.65mm, It can be used for most of the MSOP20, SSOP20, TSSOP20 to 2.54mm DIP.
B side for pin pitch size 1.27mm, It can be used for most of the SO20, SOP20, SOIC20 to 2.54mm DIP.
The PCB board mounting 2.54mm pitch Pin Header, It can be plugged directly into 2.54mm pitch PCB board, breadboard and 600mil width 20 pin DIP socket.
This is SOP20 to DIP20 208mil IC Test and Burn-In Socket with Spring. The chip will be locked very well with the spring. It applies to all SOP8 wide-bodied chip. This chip prog socket is brand new and high quality. It is RoHS compliant.