Laser 8390 Insulated Locking Extension Bar 3/8″D 250mm Features and Benefits: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. VDE certified.Size: 250mm long x 3/8″D, with a fully insulated socket locking mechanism.For use with 3/8″D insulated sockets, see Laser Part Nos .7562 (8mm), 7563 (10mm), 7564 (13mm).Manufactured from chrome vanadium.Safe operator use for live voltages up to 1000V AC / 1500V DC.VDE certified.IEC60900:2018 approved for 1000V safe working.Shorter, 125mm extension bar also available, Part No. 8389.Also available in 1/2″D, Part Nos. 8391 (125mm), 8392 (250mm).