#520 Roller Chain Connecting Links. Specification: Model: ANSI #520 Industrial Roller Chain. Material: carbon steel Package: 2 pack. Chain: These master connector links are adapt for ANSI #520 industrial roller chain. Material: The #520 roller chain connector link are made of high quality carbon steel, strong and sturdy. Application: The #520 roller chain master links are heavy duty and work on motorcycles, mini bikes, snow remover, agricultural machine and more. Package Included: There are 2pcs #520 master connector links in the parcel. Customer Service: please contact us about product questions anytime, we will provide you with a satisfactory service.