It is made of hard steel center cup joint for Doripake. It has outstanding durability by the choice made by the hard steel material excellent in strength, more optimal hardening treatment. In addition, the development of the M4 screw dedicated pin. Prevent loosening during traveling together by a pin and a set screw. Because of 2mm hex wrench can be used to securely fix it when I can. 2 pieces each cup joint, screw pin.

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