General description A 250mm insulated 3/8" 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: 3/8" D Insulation rating: up to 1000V AC / 1500V DC Material: chrome vanadium VDE certified IEC60900:2018 approved for 1000V safe working Compatibility and accessories Compatible with 3/8" D insulated sockets, see Laser Part Nos: 7562 (8mm), 7563 (10mm), 7564 (13mm) Shorter 125mm extension bar available, Part No. 8389 Also available in 1/2" D, Part Nos: 8391 (125mm), 8392 (250mm)