Mine happens to be an 11mm Craftsman brand, however I read that doesn't uniquely identify it. So far I have not had any difficulty with it on my cars or in the yards. I use it only for breaking and securing, as you write in your title, moving to a 7/16 open end as soon as the breaking is done.
The flare nut wrench or tubing wrench is not just a 6-point ring spanner with a section knocked out. The rigidity provided by a complete ring cannot be approached by an open-ended design without significant increase in strength. So, I see the point of the SnapOn design and price for the professional.
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Art Benstein near Baltimore
"A modest man, who has much to be modest about." —supposedly Winston Churchill, about Clement Attlee
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