An American National Standard. The American Society of Mechanical Engineers (ASME). Revision of ASME B107.17M-1985 (R1991). Date of Issuance: December 31, 1998. 15p. This Standard establishes final inspection gage sizes for wrench openings, and spark plug wrench openings for inch and metric sizes. This Standard does not cover every available size, but only those most commonly manufactured