Master cylinder ID help.

[birdhouse]

I have a single disc front. The MC I have needs a rebuild. How do I I.D this MC. Im kinda thinking its a 13mm bore seeing how I have I.D it with other MC's that look the same. The only markings it has is" NISSIN 7 D 1" and on top of that is marked "1/2". It is a straight lever type with a square shaped solid aluminium resevior. Thanks in advanced for the help

 

[birdhouse]

And what kit should I get from mikes?

 

[birdhouse]

Answered my own question!!!!! 1/2 inch is approximately 13mm or 12.9mm Im typing right now with my foot in my mouth!!!!! lol