Single-joystick-handle One handle extends from the top of the faucet and resembles a joystick on two-hole centerset deck-mount bathroom faucets. The joystick may be gripped and moved to adjust the temperature and flow of water from the faucet. Inside the spout, the hot and cold water supplies are combined to produce water for handwashing and grooming. Two-hole centerset deck-mount faucets are designed to fit sinks with two centered holes that are 4" apart when measured from center-to-center. On sinks with a three-hole centerset design, they can also be utilized to hide an unused middle hole.