VDE stainless steel reversible blades with reduced blade diameter and integrated safety insulation, to reach and work on deep-set screws and spring elements. Individually tested at 10,000 V for safe working at the permissible voltage of 1,000 V. All Wera stainless steel tools are vacuum ice-hardened and therefore possess the required hardness and solidity for screwdriving applications. Can be used industrially without restriction.