Ohuchi (Ouchi) Bench Chisels/Oire Nomi
Kinari Oire Nomi is a bit thinner version of Mentori for lighter and detailed work
Hiramachi Oire Nomi is even thinner than Kinari and has flat shaft for derailed work (getting into tight space) like small dovetails.
Hiramaru Oire Nomi is in between Kinari and Hiramachi. The name of 'Hiramaru" is from its shaft. "Hira" means flat and "Maru" means round. As you see, it has a flat part of the shaft to the blade body and a round part to the handle.
Which style of the Bench chisels would be suitable for you is, depending on what type of work you do the most. We would usually recommend Mentori or Kakuuchi chisels for general purpose. Otherwise, please contact us for a help to determine which chisels would be suitable for your work.