This VDE Insulated screwdriver set has been specially manufactured from chrome vanadium steel & has been tested meet IEC 60900:2009 to guarantee safe working up to 1, 000 volts. Each screwdriver features a long, thin neck for easy access whilst working on terminal blocks, control cabinets, switches, relays & sockets. The screwdrivers also feature contoured handles to ease hand fatigue & improve grip when in prolonged use.