What are the specification details of the large chassis bolts?

[robind]

I find myself taking the top off of my ArduMower a lot in order to work on it.

In order to make things easier, I'd like to buy some bolts which have knobs on the top (like the ones that @greymfm76 put on his mower here).

What type of threads are these bolts? M8?

Thank you very much

 

[wolodk]

the bolts are M8.