Teng tv18n insulated screwdriver and plier tool set 18 piece 1000 volt the teng tools 18 piece insulated screwdrivers and pliers are all produced and tested according to en 60900 iec 60900 and vde 0680 standards approved for live working up to 1000 volt acthe 13 screwdriver blades are manufactured from teng tools unique tt mv plus chrome vanadium steel to give the perfect balance of steel hardness and flexibility this produces a 20 higher performance in use than other current materials ergonomic