All copper bounce core with a spring mechanism and screw thread push pop up. This serves as a reliable replacement part for basin pop up plugs and fits most sinks. material. The plug bolt is made of solid brass with a smooth spring inside, offering rust resistance, durability, and anti corrosion performance. Easy to use. Simple installation with straightforward screw on and off operation. Package includes. Six plug bolt pop up click clack screws are included. Each piece has an open state length of about 55 mm and a closed state length of about 45.4 mm. Compatibility and performance. Designed to work with common basin pop up assemblies in kitchen and bathroom sinks, providing a durable and easy to maintain replacement option. Use scenarios: Replacing a faulty or corroded basin pop up plug in a kitchen sink. Upgrading an older pop up mechanism in a bathroom sink to a brass, rust resistant part. Retrofit for multi sink installations where a standard pop up replacement is needed.