-The regular 16 1/2" vessel sink needs a 1 3/4" hole and faucets need a 1 3/8" hole on the countertop.

-There are two washers on the glass vessel sink drain. You just need the thin washer and don't need the fat washer if you install the glass over the countertop. Simply keep the thin washer between the drain and the vessel sink.

-When installing the drain, don't over tight the nut underneath the countertop or it might damage the sink by having too much pressure on the sink.

-For Waterfall Faucet installation, make sure to have the actually faucet and sink on hand before drilling any holes on the countertop, waterfall faucet is different than the regular single handle vessel sink faucet.

-For Stainless steel kitchen sink installation, we recommend to have a piece of wood cover the cabinet, then drop in the undermount kitchen sink, so it doesn't need to be installed with clips.