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Slowpoke -- Probably the most common 4-point and 8-point flat wrenches are were not sold as mechanics' tools, but were instead sold to machine shops as "tool post" wrenches. In case you don't know, a "tool post" holds the tool or toolbit of a lathe or other machinetool on a moving part of the machine that guides the cutting edge into the workpiece. Old-time tool posts usually used square-head setscrews to clamp the tool or toolbit in place, and since the old-time cutters needed to be redressed frequently those setscrews needed to be loosened and tightened many times during the passing of a day. Up into the 1960's the major industrial tool makers offered a variety of different tool post wrenches, with wrench openings (open end or box end) on one or both ends of the wrench shank. The single-end box-end toolpost wrench was probably the most common. Is your wrench a toolpost wrench? Maybe, but I suspect not simply because it is very long for the size of the openings. Neither do I suspect that it was intended as a tool for loosening and tightening square-head bolts. Instead, I have a hunch that it was built as an adjusting wrench of some sort, perhaps automotive brakes or some sort of manufacturing/processing machinery. John
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