hiramachi nomi have flat shafts rather than round shafts so you can dig deep without the shaft interfering with your cut, but are not for hitting heavily

this example is 15mm and oire sized so roughly 220mm Yasaku brand Miki city, i have seen chu sized examples but i have no idea who made them

sizes available

3,6,9,12,15,18,21,24,30,36,42 &48mm