These are the clips that slip over the edge of sheet metal to allow a screw to be installed.
Aftermarket product, usually an enhancement product.
Find in OPGI's 2018 60 Special Catalog page 158.
This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.