To be honest I have never really thought much about it. I know that the spine doesn't touch my face. I typically just put the razor on my face and start shaving. I think the spine stays off of my face by the width of about a spine? If I need to alter my angle a bit I will depending on which portion of my face I am shaving. I have never actually thought about the angle and degree of the razor in relation to my face. I just put the metal down and enjoy what feels right. Cheers!