These unique chisels don't really fit into any pre-existing chisel category, being too long and thin to be an Oire-nomi, and with their round neck, they are not a true usu-ba (thin blade) chisel either. So even though they can't be readily identified, the real question is "what are they"?
They are something of a 'hybrid' chisel, offering most of the extended depth of cut and access to tight areas of the traditional usu-ba-nomi, their long round neck resists marring any surrounding material to where they are being used and their heavier than usual construction makes them more rigid than the traditional flat tang usu-ba-nomi.
That's a long winded way of saying that these chisels are designed to eliminate the one, occasional shortcoming of true Usu-nomi. The fact that they are elegant and nicer to use is one of those little bonuses in life.
Only offered in bright finish, laminated blue steel blade, black hooped gumi (Japanese boxwood) handle and unique to Koyamaichi.
Thin blade/round neck Oire-nomi.
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