Blanco Spex Plus Premium Single Bowl Undermount Kitchen Sinks, Blanco 440260, Stainless steel kitchen sinks, Blanco Spex 440260 is part of the Premium Collection. Single Bowl Undermount Sink. 18 gauge. The usable sink space is 21" wide x 16" from front to back. The total size of the sink is 23" wide x 18" from front to back. The bowl is 8 1/2" deep. The required outside cabinet space is 27". Value engineered designs, including a broad selection of styles, configurations and special features. Featuring a Satin finish.