Layout files in this folder were created using ExpressPCB tools.

The gerber files are formatted as RS-274-X files.  

The drill file includes the hole size definitions.  

The diameters listed refer to the finished hole sizes after plating, not the drill size.

Each file can be identify by it's extension:

     .SLK = top silkscreen layer
     .SMT = top solder mask layer
     .TOP = top copper layer
     .BOT = bottom copper layer
     .SMB = bottom solder mask layer
     .DRI = drill file
     .OLN = board outline