General description A 250mm insulated 1/2" D extension bar featuring a socket locking mechanism with a fully insulated pull-back quick release collar, designed to protect up to 1000V for use on hybrid and electric vehicles. Technical specifications Length: 250mm Drive size: 1/2" D Material: Chrome vanadium Voltage protection: Up to 1000V AC / 1500V DC Certification: VDE certified IEC60900:2018 approved for 1000V safe working Compatibility and accessories Compatible with 1/2" D insulated sockets, see Laser Part Nos 7988 - 7997 (11mm - 19mm) Shorter 125mm extension bar available, Part No. 8391 Also available in 3/8" D, Part Nos 8389 (125mm) and 8390 (250mm)