The knipex 7 way cabinet control key is suitable for control cabinets and shut off systems in the supply of gas water and electricity eg air conditioning ventilation systems shut off valves mains switch boards etc supplied with a securing chain it has the following functions 3 x square 5 6 8mm1 x triangular 9mm 1 x two way 3 5mm1 x double ended bit slotted 10x7mm and ph21 x 14in bit adaptor