A comprehensive set of fully insulated open end spanners for use on modern hybrid and electric vehicles, including sizes from 7mm to 24mm, suitable for live working up to 1000V AC/ 1500V DC. The spanners are both GS and VDE certificated and manufactured according to the IEC60900 standard for safe use in a high voltage environment. The sizes are clearly marked on the side for easy identification and are supplied in a robust carry case for safe storage.