Found the answer to your own question then did you Danga? haha
M-8 is a 8mm threaded bolt, which I think usually uses a 10mm socket....? :? lol
nah M6 uses a 10mm socket
M.8 is 13mm socket
M10 is 16mm socket
if i remember correctly from my time on the shop floor. Shame my Zeus book's at work so can't really help you till monday now
PS why is M.8 without the . filtered?