Insulated open ended spanner set, for hybrid and electric vehicle servicing and maintenance, in a range of useful sizes from 8mm to 19mm, 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 size for easy identification and are presented in a fitted carry case for safe storage.