For control cabinets and shut off systems in the supply of gas, water and electricity. For technical installations in buildings, e.g. air conditioning and ventilation systems, shut-off valves, main switchboards, etc.. 4 arm version - includes the following keys: (3) Square - 13/64" (5 mm), 15/64" (6 mm) and 5/16" (8 mm), (2) Triangular - 9/32" (7 mm) and 23/64" (9 mm) and (1) Dual bit - 1/8" - 13/64". With bit insert: slot 3/64" x 9/32" and P2. With adapter for 1/4" bits on securing chain. Additional adapter for 1/4" bits in one arm. Total length 3". Zinc die-casting.