Kitchen faucet sizes are not completely universal; they usually come in different sizes and types. The choice of size depends largely on the size of the sink and the size of the faucet hole. Generally speaking, the common kitchen sink hole size is 8 inches (203 mm), so when shopping for a faucet, you can choose a matching 8-inch hole to install the faucet.

In addition, there are some other sizes of kitchen faucets available, such as 4 inches, 6 inches, 10 inches and so on. Therefore, before buying a faucet, you should measure the size of the sink hole and choose the right faucet according to that size.

In short, although there are some common sizes to choose from, the size of different kitchen sinks may vary, so it is best to choose the right faucet according to the specific situation.