A-A-2016 Box, FoldingThis description covers Post Office Money Order Forms Box, Fiberboard, Special Use, type I. Type I shall be one-piece, tuck-end style (OPTE), modified as showin in figure 1. The size shall be inside dimensions, in inches, as follows, with a tolerance of minus 0, plus 3/16 inch: Length 8-1/2 Width 2-1/4 Depth 3-1/4