The screw is made of high quality brass. It is not easy to rust, lightweight and durable for long term use. Replaces the solid brass click mechanism. There is a stainless steel spring inside the screw, which is durable and rustproof. The pop-up effect is facilitated by the use of spring mechanisms and threads. Simple operation, quick installation and disassembly, saving time and effort. Great replacement part for your sink pop-up drain valve. This replacement screw can be used with most kitchen sink drain plugs. Used as a replacement part for pop-up sink drain valves. Easy to install and comes with hardware and gasket, it is the perfect accessory for your brass bathtub stopper. Packing list: 3 X Drain Accessories