These specialty titanium bolts are original replacements for the Extralite Hyperstem. These bolts are manufactured by Extralite specifically for the Hyperstem; they are the only bolts approved for use with this stem. They are not compatible with other manufacturer's stems. These M4x12 bolts are equipped with a T20 torx head.
If you have a stem that has 4 - M4 bolts and 2 M5 - Bolts, please give us a call @ 520-624-3045 to inquire about availability of the M5 bolt.