High Quality: The faucet is made of solid brass and ceramic, durable, temperature and wear resistant, rust-proof and can be used for a long time. Good Sealing: This replacement faucet has an easy-to-use black rubber retaining washer, which ensures a good seal and prevents leaks. Dimensions: The faucet sleeve has 20 teeth on the spline and has been drilled and threaded to fit a 4mm diameter. Please read the size chart carefully before purchasing to ensure compatibility. Easy Installation: The O-ring at the bottom of the spool is easily visible. Red turns counterclockwise to open the faucet, blue is the opposite of red. Widely Used: Set containing two ceramic valves and 2 4mm screws for single or double mixer taps for kitchens, sinks, cold and hot water. Specification: Material: Brass, Ceramic Model: 1016-S Teeth on Spline: 20 Teeth Max Voltage: 3.5 (KpA) High Working Temperature: 90 Size: 50mm x 24mm Package Includes: 1 x Blue Replacement Valves (Clockwise) 1 x Red Replacement Valves