According to the measure of installation hole of the faucet,a basin faucet have 3 types- single hole basin faucet,double hole centerset 4 inch basin faucet and three hole 8 inch widespread basin faucet.
The basin faucet with single hole just is installed the single hole faucet.the diameter is usually is 35mm. this basin mixer are the single lever which control the hot and cold water. it is the most option for family.
4 inch basin are common in USA, most of the faucet is 4 inches,the small hole in center is used to install the draw bar which for pop up waster.
8 inch basin can be installed three hole basin faucet. the handle and spout are separate part, they are connected by the hose.
8 inch widespread also can be installed single hole faucet,but you shold need to cover the other two holes by a panel.
check the below.
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