This product includes :
CVD-2pcs
Screw Pin M4x2.5x12-2pcs
4x2.5 Silicone O-Ring-2pcs
Product major function & usage:
Transferring the energy and leading the drive of the wheels
1. Constructed with a harden steel 45# along with aluminum 6061 T6 human body which are often sturdy and lightweight.
2. CVD design for smooth rotation.
3. Retractable design provides more room whilst the rocker swings better.