SubMaster, 'Electric', patented, universal locking range, with the double turning mechanism 8 different lockings can be positioned. A 5 mm square is particularly suitable for heating ventilation, for lockings in industry, trade, heating, public services and many more. Locks: Square: 5, 6, 7, 8, 9, 10 mm, Triangular: 7, 8, 9, 10, 11 mm, Hexagon socket: 1/4'