This flexible stainless steel ruler measures inches and centimeters on one side and has a conversion table on the reverse side. It is precise to 1/2 millimeters across one edge and 1/32" on the other edge. All graduations are deeply etched. The conversion table converts between fractions of inches and millimeters, and also has tables for tap drills and W.W. UNF thread size. The ruler measures up to 6" (152 mm). The overall length is 7" (178 mm). The width is 11/16" (16.7 mm).