Bestcare Chrome, Cone, Bathroom Sink Faucet, Manual Faucet Activation, 0.70 gpm WH3374 PPZ Mount Type Recessed Mounted Select fitting and seal material Select fitting and seal material based on the chemical compatibility of the liquid involved The shelf posts included in the design are fashioned out of rectangular stainless steel tubing that measures 1 2 of an inch by 1 inch in size Single metering handle two hole centerset deck mount bathroom faucets have one handle that users push down on to start the flow of water through the faucet Two hole centerset deck mount faucets install onto sinks that have two centered holes that are 4" apart when measured from center of hole to center of hole