Poly steel roller chain is usually a specifically engineered roller 
chain that is designed for applications that require a light-weight, highly https://www.ever-power.net/product/ploy-steel-chain/ corrosion resistant roller chain that may operate in a wide range of temperatures. For regular poly metal applications you can use the standard poly metal roller chains and for food grade applications use the food grade poly steel roller chain.
Ploy Steel Chain
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