38 (Millimeters, mm) unit for measure distances, lengths, heights and widths in Metric Units One millimeter is equal to inches On this page we consider in detail all variants for convert 38 millimeters to inches and all opportunities how to convert millimeters with usage comprehensive examples, related charts and conversion tables for millimetersThe longest markings will be the quarter inch markings, ie the first marking is 1/4 inch, the second is 1/2 (2/4) inch, the third is 3/4 inch The next longest markings will be the eighthinch markings, ie the first marking is 1/8 inch, the second is 3/8 inch, the third is 5/8 inch, etcThe British Standards Institute defined the inch as 254mm in 1930 in the document "Metric Units in Engineering Going SI" In March 1932 the American Standards Association were asked to rule on whether to adopt the same value (at the time the American inch was 1/ mm which approximated to mm) Amazon Com Sunex 319m 3 8 Inch Drive 19 Mm Impact Socket Home Imp...