RothenbergerIndustrial - Universal Step Wrench - Ø 3/8" - 1/2" - 3/4" - 1''

I've tried several radiator valves and this only fits one of them and it fits little else that I'd possibly have a use for. The tool itself doesn't just clip on to a wrench, it needs a 1/2 inch female x 1/2 inch female adaptor before you can even attempt to find a use for it. Totally pointless tool.