BIG DAISHOWA-Americas - HSK Tooling System HSK is a German acronym that means hollow taper shank and serves as the hollow taper interface that connects to HSK machines using flange contact. Materials,HSK TURNING TOOLING | BIG DAISHOWA SEIKI CO., LTD.,HSK-F63-MEGA10E-105 | BIG KAISER,HSK Tool Holder And Tooling System From BIG DAISHOWA