Quick question on bolt size

[Reuvers]

Hi guys,

I just brought my carriers and discs to machine factory to get them milled and redrilled

However have one last question:

The discs as seen below,

have 9 bolt holes in them already. Now I know I can use 2 existing holes and need to get 2 new ones drilled in.
Like seen here

However existing holes are 15.8mm in diameter, whilst the space between the holes (where new holes have to be drilled) is only 15mm. That means there is not enough room...

So question is, what size are the bolts holding the discs in place?

thanks...

 

[Reuvers]

Trying to find some info on the net, am I right saying diameter is m12?

 

[Ricardo_Smooth]

m 12 is right mate yes

 

[Reuvers]

cheers mate. big shout out to you