AZ honyaki knives are forged from Uddeholm UHB20C—a clean, high-carbon Swedish steel with properties similar to White #2. The steel is differentially hardened using the abura yaki-ire technique, where a clay coating creates a harder edge and softer spine when quenched in oil. The process demands close control over variables like clay application, quench time, and blade geometry.  The result is a durable, high-performance blade with a visible hamon and a hardness of 62–63 HRC.

Santiago Aberastain handcrafts each knife, handle, and leather sheath in his one-person workshop in Puerto Deseado, Patagonia. His knives are produced without serialized production—defined by their function and style, yet never identical. In addition to his craft, he’s been active in politics for over 13 years, regularly traveling over 3,000 km each month between his hometown and the provincial capital, Río Gallegos. Santiago's work is both a grounding ritual and personal commitment to craftsmanship.