Хятадын SP цуврал өнхрөх гинж өндөр бат бэх богино …
SP Series Double Strand Roller Chain is also commonly referred to as a duplex roller chain and consists of two single strands of roller chain that are manufactured together. The benefit of a double roller chain is a high-strength chain with a relatively small form factor; the purpose of a chain is to transmit energy to the highest possible degree of efficiency.