The Knipex 7 Way Cabinet Control Key is suitable for control cabinets and shut-off systems in the supply of gas, water and electricity, e.g. 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 & 8mm.1 x Triangular: 9mm. 1 x Two-Way: 3-5mm.1 x Double Ended Bit (Slotted 1.0x7mm and PH2).1 x 1/4in Bit Adaptor.