1. Steel sprocket welded with tube, make it capable to transmit higher torque, and meet the request of transportation of heavy duty load.

2. The bearing at the end of the sprocket is dismountable, not only increase load capacity, but also helpful for maintenance and replacement.

3. Precision ball bearing is fixed by impact in the steel housing, tight and durable.

4. Tight steel bearing housing could bear heavier duty than polymer bearing unit.