- The standard English System unit of length measurement However, in Bali the word is not normally recognized as referring to the word inch, since Balinese people use the Metric System and are not conversant with the English Sysetem. It is normally used by fishermen to refer to the size of the mesh of a net, since this is how nets are sold. With reference to nets the number of a particular net is the diagonal distance between opposite corners of a single mesh opening. Hex head bolts and wrenches for foreign-made objects are sometimes specified, e.g. a one-half wrench.