The M3118 undermount sink has a single bowl made from 304 grade stainless steel and is available in your choice of 18 or 16 gauge thicknesses. The surface has a brushed satin finish to help mask small scratches that occur over time and keep your sink looking beautiful for years. The overall dimensions of the M3118 are 31 1/2" x 18 3/4" x 10 1/8" and a 33" minimum cabinet size is required. This sink contains a 3 1/2" center drain, is fully insulated and comes with sound dampening pads. As always, our stainless steel sinks are covered under a limited lifetime warranty for as long as you own the sink.