International 19 piece set of insulated sockets and accessories the sockets reversible ratchet and extension bars are totally insulated for maximum personal protection made from injection moulded nylon 11 which exceeds the requirements of iec 60900 the industry standard for live line working in addition these tools meet the requirements of category c which requires them to perform at extreme temperatures of 40c to 43 70c making them unique in this category the set contains 8 x metric socket