Master cylinder nut size

[Tomo3292]

Gents I'm after some help.

Replacing brake lines on the clio using a 1.6 master cylinder and splitting the front brakes.

The two holes on the master cylinder seem to be different sizes.

M10, M12 at a guess anyone shed any light on this for me.

Cheers

 

[Pauleds]

M12 x 1mm
M10 x 1mm

 

[Tomo3292]

Legend All over it mate cheers