Total quenching （ hardness HRC 48-52 ） SUS420J2 material stainless steel is a high-precision made from hardened stainless steel top quality products.
Checking surfaces, and the finish on the undersides of planes. For accurately checking and making precision adjustments to the undersides carpenter planes. After tempering and mechanical polishing, each piece is carefully adjusted for straightness, and finished by a skilled craftsman.