The design of the Japanese pattern could well reflect the use of softer timbers used in traditional Japanese furniture making, the auger having a deep, high ratio flute, quickly removing the longer slivers softwoods create. The auger bit on this type has a point on the end, one cutting spur and a single spiral for rapid chip clearance. The single spur is easy to sharpen and the bits cut evenly and fast, even in the hardest of timbers.Either way, a high quality chisel will enhance your morticer's performance to a degree where once tried you will never use a low quality chisel again. Admittedly, they are a big investment, but, what a difference!N.B. As all the auger bits have to accommodate different machines they are supplied long and will need cutting with a conventional hacksaw blade to suit the specific machine for which purchased.