For all common gas, water and power supply shut-off systems as well as for technical installations in buildings, such as air conditioning and ventilation systems, shut-off valves, power panels, etc.. With built-in bottle-opener Functions: 1. 5 mm internal square 2. 6 mm internal square 3. 8 mm internal square 4. Internal triangle 9 mm 5. 3–5 mm double bit 6./7. Reversible bit: For cross (PH 2) / slot 1 x 7 mm 8. 6.3 mm (1/4″) magnetic bit mount