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       tube d              shaft d               size               chain pitch        teeth          chain's type   

1. adopt sprocket made of polyamide as the driving element, so the running noise has been greatly lowed down.
2. the design makes it is able to opeate in some special environment, and not only for good looking but also further more for the smooth and quiet running.
3. it is resists dust and water splash well
4.parameters：bearing housing: polyamide and black；end cap: polypropylene and yellow；precisino ball bearing: 6002；sprocket: polyamide and black
5. material: steel, zinc-plated, stainless steel,
6. installation method: spring loaded, female thread,