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It's 86mm with 16 flutes.
There's the heavy "will survive a nuclear blast" model made by Assenmacher that can be found for around $20. IPD also sells a cheaper model made by CTA Tools for around $6. It's CTA part A261. It can be found at http://www.autopart.com/TOOLS/TOOLSMAIN/tool/T_A261.htm for about $2 before s&h.
I think that PEP boys also carries the CTA one for around $4.
Although I love the look and feel of the Assenmacher wrench it's tough to justify the price for a non-critical tool that's used so infrequently, so I bought the CTA. It works just fine.
There are also a couple of cheap ones on EBay, but I read that the 3/8" "socket" can break off.
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