Two packs included: 1 blue (cold water) and 1 red (hot water) G1/2" sink faucet cartridges, with sturdy M4 screws provided. Key benefits - Color coded cold and hot functions: the blue cartridge is for cold water and the red cartridge is for hot water, helping prevent mix-ups during installation and maintenance. - Durable construction: brass body with ceramic disc valves for long-lasting performance and reliable shut-off. - Practical size and compatibility: 20 grooves with a groove diameter of 7.6 mm and a total height of 50 mm. Suitable for approximately 75% of single or double faucet configurations. - Easy installation: includes 1 screwdriver and 1 wrench for straightforward setup; smooth turning action and reduced dripping. Specifications and compatibility - Cartridges: G1/2" (sink) standard size. - Grooves: 20 grooves; groove diameter 7.6 mm. - Total height: 50 mm. - Suitability: compatible with most bathroom and kitchen sink faucets; supports both cold and hot water. What’s included - 2 faucet cartridges: 1 blue (cold) and 1 red (hot) - 1 screwdriver and 1 wrench - 2 sturdy M4 screws Installation notes - Please check the dimension picture carefully before purchasing to confirm fit for your faucet model. - Tool-assisted installation with the provided screwdriver and wrench ensures a secure fit and reliable operation. Use scenarios - Replacing worn or leaking cartridges in a bathroom sink faucet, restoring smooth hot and cold control. - Replacing cartridges in a kitchen sink faucet to restore precise temperature control and reduce dripping. - Upgrading or repairing a dual-handle or single-handle faucet setup where G1/2" cartridges are compatible, ensuring both hot and cold sides function correctly.