The board size is 50 * 35.5mm

The zip file contains the following files:

Aperture.ger	Aperture list
Bottom.ger	Bottom layer
Drill.exc		Excellon drill file
Mask.ger	Solder mask
Outline.ger	Board outline
Silkscrn.ger	Silk screen
Tools.txt	Drill list
Topview.gif	View of the board from the top/component side


Gerber file format:

RS274-X
2.3 Format
ASCII
Absolute in inches
No zero suppression
<CR><LF> end of line


Drill file format:

2.3 Format
ASCII
Absolute in inches
No zero suppression
<CR><LF> end of line