The PPR-10 rivet is designed to fit square or round holes for universal application. These rivets are recommended for 0.250" diameter holes or 0.220" square holes with a panel thickness of 0.140" to 0.200". Rivets are made of strong and durable Nylon material in natural color. The PPR-10 rivets can be removed by hand, screwdriver or tools provided by the firm. AT THE SITE: drawings and pdfs.