head bolt spline bit 16v

[fat_frumos]

Hello gents, can someone please tell me what size is the spline bit for a 16v head bolt? i need to buy one and need this information.
Also, how is the socket called for taking the cams off and what size it is?

Thank you and sorry for the silly questions.

[midz16v]

m12 spline mate
not sure of the socket u need tho

[fat_frumos]

Thank you mate, i can go and buy my spline now. Off comes the head.
Cheers