What is the size of the faucet mounting hole? What kinds are there?

Household kitchen faucet size: We often hear people talk about the specifications of the faucet, and often say that the score is 1/2, 3/4, etc. 1/2 3/4 is in English, Convert to metric system: divide 1' into 8 parts, and express the pipe diameter according to 25.4mm = 1 inch: 1 minute 1/8*25.4mm =6 2 minutes for pipe diameter 2/8*25.4 mm =8 3 minutes for pipe diameter 3/8 * 25.4. Generally, the size of the hot and cold faucets we see is a little larger than that of ordinary faucets, because there is a hot and cold faucet inside. Therefore, the size of domestic hot and cold faucets is generally relatively large, but it is very important to pay attention to the installation size of domestic hot and cold faucets when purchasing.