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Square: 6-7mm 8-9mm 10-11mm. Triangular: 7-8mm 9-10mm 11-12mmProfessional 8 arm cabinet and shut off system control key consisting of two 4 arm cross keys held together with a magnet. Ideal for use with facilities locking systems (heating, sanitation, air conditioning, electro technology), gas and water supply and shut-off-systems.10 ways utility utility gas meter key cabinet box electric triangle triangle cabinet 10 in 1 key cross utility universal square