Acc. to DIN 3129, ISO 2725-2, Machine-operated, suitable for all standard electric and air tools, Square drive as per DIN 3121 - H 20, ISO 1174, Vanadium steel 59CrV4, burnished, DBGM (German utility patent), Particularly ideal for work in sensitive areas, where safety against loss, process safety and occupational safety are permanently present, Example