High quality: The faucet is made of solid brass and ceramic, durable, temperature and wear resistant, rust-proof, can be used for a long time. Good sealing: This faucet valve replacement has an easy-to-use black rubber fixing washer, which can seal the faucet well and prevent the faucet from leaking. Size: The faucet sleeve has 20 teeth on the groove and has been drilled and tapped to fit 4mm. Please read the size chart carefully before purchasing to ensure compatibility. Easy to assemble: The O-ring at the bottom of the spool is easily visible. Red rotates counterclockwise to open the faucet, blue is the opposite of red. Widely used: Set containing two ceramic faucets and 2 4mm screws for single or double mixers for kitchens, sinks, cold and hot water. Specification: Material: Brass, Ceramic Model: 1016-S Teeth on Groove: 20 Teeth Maximum Voltage: 3.5 (KpA) High Working Temperature: 90 Size: 50mm x 24mm Package Includes: 1 x Blue Replacement Valves (Clockwise) 1 x Red Replacement