Real dimensions of Late Roman spearheads

[Diocle]

Well , thanks dear guys, as Valentinian says we should clearly define the various types and identify exactly what distinguish a veruta from a lancea, but....if we speak of dimensions of the balde we could be able to fix a max and a min regardless of the type.

Thanks Jhon for the link, am I right if I say that the dimensions of the blade could vary between 19/20 and 29/30 cm.?
The cavalry types were more heavy? Can we distinguish between cavalry types and infantry types?