General description This set includes 4 ceramic disc heads designed for hot and cold faucet replacement. Made from high-quality brass and ceramic, these cartridges are durable, rust-proof, and built to last. Technical specifications Outer diameter: 7.5 mm Inner diameter: 4 mm Total length: 50.4 mm 20 gears above the valve core Compatibility and accessories This universal ceramic faucet cartridge is compatible with approximately 70% of faucets. It is suitable for replacing cold and hot water faucets in sinks, bathrooms, kitchens, etc. Please check the dimensions in the picture carefully before purchasing to ensure compatibility. Installation To install, assemble according to the characteristics of your faucet. The red O-ring at the bottom of the spool helps in easy identification and installation. Turn clockwise to open the faucet and counterclockwise to close it.