Product description: Item:SS-8107 Dimension:30-1/2" x 19.5" Deep:9"/7" Thickness:18,20 Gauge Material:304(18/8) Finish:satin,polish Description:3-1/2"(114)drain opening All of our Undermounted stainless steel double-bowl sinks are made of high grade stainless steel with 1.0mm-1.2mm in thickness. High quality one-piece or seamlessly welding formed. Full undercoated and firm pads on sides and bottom of the bowls for sound deadening, moisture proofing and anti-vibration. Includes standard template cardboard and fastening clips. Finishing: satin, polish, give long lasting beauty. Material: ss.304 or ss.202 is available. We can also supply you a full range of stainless steel sinks, such as under-mount single-bowl sinks, top-mount single/double/triple-bowl sinks, undermounted right-angled single/double-bowl sinks, and circle sinks Packing:Carton with foam