The Bahco 9-in-1 Switch Cabinet Master Key is suitable for all the usual technical shut-off systems. It has a varnished plastic body with a practical securing chain and snap-hook. The key profiles are zinc die-cast for increased durability. The Master Key has 8 different keys, which are fitted on a double turning mechanism, allowing good positioning. In addition, the body houses a 5mm square key suitable for aerating radiator valves and a 1/4 inch magnetic bit holder. It has the following functions: 4 x Square: 5, 6, 7-8 & 9-10mm. 3 x Triangular: 7, 8-9 & 10-11mm. 1 x Two-way: 3-5mm. 1 x Half-moon: 6mm.