It is very convenient for work sites and outgoing work.
The polish of the drill bit, which is very difficult for an amateur, can be easily polished with an electric drill attached to the body "Insert the hole into the bit size display and twist while pressing lightly," resulting in a sharpness comparable to that of a craftsman.
Specifications
Country of production: Japan
material: Body/Polycarbonate, Grindstone/WS Material (grain size # 120)