This rocker style spring tension roller assembly is used by several patio door manufacturers. The body is stamped steel with a tension spring attached. It has a 1 inch high density polyethlene roller. It is used on the top as well as the bottom of the screen door.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.