Blanco Spex Equal Double Bowl Kitchen sinks, Blanco 440258 Stainless steel sinks, Stainless steel kitchen sinks, Blanco spex 440258 is part of the Premium Collection. Single Bowl Undermount Sink. 18 gauge. The usable sink space of each sink is 14" wide x 16 from front to back. The total size of the sink is 31 1/8" wide x 18" from front to back. The bowls are 8 1/2" deep. The required interior cabinet space is 33". Value engineered designs, including a broad selection of styles, configurations and special features. Featuring a Satin finish.