- Z4 Bearings, Anti-slip, Ultralight.
- Torque test up to 15 million transfer.
- The surface takes anodic oxidation, the hardness of surface can be HRC156 °.
- Each side have 8 cleats,more firm and anti-slip
- Different thrreads each side,can read the “L” and “R”
- High strength waterproof seal
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