Established in 1975, the Tasai lineage is globally recognized for exquisite chisels. Famed for mastering a specialized 'Blue Steel 1.5' alloy and integrating traditional swordsmithing techniques into toolmaking. Both Akio and his son Michio are certified Japanese Traditional Craftsmen (Dentō Kōgei-shi). Their chisels are characterized by an exceptionally deep hollow back and a water quench that produces legendary hardness.