"Yet another example of incorrect or misleading description. This tool is a service cabinet key not a radiator key although it may fit industrial type radiators but certainly not blead nipples or lock shield valves on domestic radiators."
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Review 5 for Plumbing Tools by Rothenberger 4-Way Radiator & Services Cabinet Key
"Should not be advertised as a radiator key. Bought to bleed a few radiators in my house, which are a mixture of new and old radiators, with 2 or 3 different size/type of bleed nipple. None of the heads on this key fitted a single one. I guess it's more for the meter cabinet locks."