Blanco Magnum Single Bowl Undermount Kitchen Sinks 440290, Stainless steel kitchen sinks, Blanco Magnum 440290 or is part of the Premium Collection. Single Bowl Undermount Sink. 18 gauge. The usable sink space is 19" wide x 16 from front to back. The total size of the sink is 21" wide x 18" from front to back. The bowl is 10 1/2" deep. The required outside cabinet space is 24". Value engineered designs, including a broad selection of styles, configurations and special features. Featuring a Satin finish.