Product Code:SAE MA1586Title:Wrench Configuration, 12 Spline Drive, MetricIssuing Committee:Eg-1b Hand Tools CommitteeScope: Tools conforming to this standard will wrench fasteners having wrenching configurations per MA 1549. Nominal wrenching size value corresponds to maximum width across flats of comparable hexagon and double hexagon (12 Point) wrenching configurations. The wrench will fit all three configurations.Rationale: Tools conforming to this standard will wrench fasteners having wrenching configurations per MA 1549. Nominal wrenching size value corresponds to maximum width across flats of comparable hexagon and double hexagon (12 Point) wrenching configurations. The wrench will fit all three configurations.