Standard size range needed? or get _.5 metric sizes?

[Schugg]

no body knows??!

[1NonlyAccord]

depends on what your doing on the car.body panels are usually 10mm or so.
iv used 5.5 a few times at the shop but it was for headlight covers rubber covers,but that was on a ford ranger.
i just have a craftsman box with the 1/4-1/2 with standard and metric inside sets all the way up to 32+
but like i said i work at a bodyshop and it really depends on what part your working on.