High-quality Materials:The faucet spool is made of high-quality brass and ceramic, which is durable and rust-free for long-term use 20-gear Universal Valve Core: There are 20 gears on the top of the valve core, the outer diameter is 7.5mm, the inner diameter is 4mm, the total length is 51mm. It is the most common size of the tap cartridge valve. Please read the size picture carefully before buying. We recommend that you take off the old faucet. To compare sizes, ensure compatibility Good Sealing: This tap valve replacement has a black rubber retaining washer that is easy to use, seals the faucet well, prevents the faucet from leaking, and saves the need to change the faucet again, making your life easier Red & Blue Logo, Easy to Use: The red and blue O-rings on the bottom of the spool make it easy to distinguish and make installation easier. Red is rotated clockwise to open the faucet, counterclockwise to close, and blue is opposite to red. Please assemble according to your faucet characteristics during installation Widely Used: The set contains two ceramic tap valve (1 * blue & 1 * red) with 2 4mm screws for faucets in bathrooms, kitchens, etc. Can be used for single or double hot and cold water taps NOTE 1. The product size is measured manually, and there will be a 2mm error due to factors such as different measurement tools and measurement methods. ad replacement for kitchen Bathroom Faucet tap NOTE 1. The product size is measured manually, and there will be a 2mm error due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products~