Metric socket wrench inserts with hexagon head. Short version. Fine crosswise fluting for more grip, helpful when "pre-tightening" the screwed connection, for instance. Drive: 1/2 inch square drive with ball catch groove to DIN 3120, ISO 1174 Tip: Hexagon head Material: chromium-vanadium steel Surface: fine satin finish Standard: DIN 3124, ISO 2725