Fiberglass Spring Plates are an essential part of any swivel rocker outdoor patio furniture chair. Made of durable fiberglass, this replacement parts keeps your outdoor swivel chair rocking back and forth without allowing you to tip over backwards. Swivel chair spring plates are easily installed and is a great DIY project for your outdoor chairs. Check out our How To instructions on the website. All Spring Plates are solid and are not predrilled. Use your old spring plate as a pattern and mark the placement holes. A standard drill can be used to make the new holes. You can also paint the spring plates any color to match your patio chair. Standard spray paint will work just fine.