6 pc 12-Point Metric Flank Drive® High-Performance 0° Offset Box Wrench Set (8-19 mm). Longer wrenches for extra leverage. Box ends offset 0°. Meets AS954 Standard for high-strength tool designed to wrench 12-point AErospace fasteners. Box ends have the exclusive Flank Drive® configuration to prevent rounding the fastener corners; the proven design for turning fasteners. Set contains XDHFM810, XDHFM911, XDHFM1214, XDHFM1315, XDHFM1618 and XDHFM1719 (8-19 mm).