Stainless steel EASY TO INSTALL: This single hole deck mounted arc sink faucet can easily be connected to your water supply system or RV with an adapter. Diameter of hole in sink should be 18mm to 38mm. HOT/COLD WATER SINGLE FAUCET: It can be hooked to either the hot or cold water line, but there is only one handle, so it would not work for both hot and cold at once. High arc spout gathers water together and reduces splash. Environmentally friendly, controllable, no waste. THREAD SIZE: 1/2 inch US standard chrome plated threaded. You can connect it to a garden hose, dishwasher, kitchen sink, dock sink, washtub sink. Ideal for outdoor use, such as on a boat, camper, or other location. EASY TO OPERATE: The kitchen faucet is 10 inches tall. Single handle design allows easy control of water flow volume. High arc 360-degree swivel spout provides full range washing access. Q: What is the length of the threaded area? A: It is 1.8 inches (4.5 cm). Q: What size hole do I need to drill in the countertop? A: 3/4 inch. Q: What is the compatible size of the hole for the cold water dispenser? A: The one-hole installation faucet is compatible with a 1/2 inch hole. Q: Does the aerator come off and will we be able to attach a portable dishwasher adapter to this faucet? A: Yes, you can attach a portable dishwasher adapter. Q: Can it be used on a boat or fish cleaning station? A: You can use it on your boat, camper, garden, marine, or other outdoor areas. Q: When using with an RO system, is the faucet so thick that water would tend to dribble out? A: Yes, it can be fed by a standard garden hose and provides ample water pressure for its intended purpose.