ours is 56 9/16" long and the outside dia. is 2.945"
it's annoying, most standard cardboard cores that vinyl comes on don't fit it, i really wish they uses the same type of tube they use for the laminate roll so you could have the backer paper roll up onto a core for easy removal and disposal, as it stands now you need to either cut the roll of backer paper, or unroll it all loosely. PITA