SENQCIA Inspire Series SBR roller links are manufactured in accordance with the ASME/ANSI B29. 4 American roller chain standard for conveyor series double pitch chains. They offer exceptional performance and long life in a wide variety of applications. These component parts possess solid bushings and rollers for improved strength and wear life. They are available to be installed in the field to repair damaged parts or lengthen existing strands as needed however two connecting links (sold separately) are required for field installation.