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What kind of a hex key do I need?

What kind of a hex key do I need?

The following hex keys fit the given sizes of the tubefittings:

Size A = (21.3 mm diameter fitting)
Size BC = (fittings with a diameter from 26.9 mm to 33.7 mm)
DEF size = (fittings with a diameter from 42.4 mm to 60.3 mm)