Metric socket wrench inserts with hexagon head.
Fine crosswise fluting for more grip, helpful when "pre-tightening" the screwed connection, for instance.
Drive: 1/4 inch square drive with ball catch groove to DIN 3120, ISO 1174
Tip: Hexagon head
Design: Chromium-vanadium steel
Surface: Fine satin finish
Standard: DIN 3124, ISO 2725