Blanco Precis Multi-level 1.75 Bowl with drainer, Blanco 441292, Blanco 441293, Blanco 440410, 440408, Blanco 440409, 440411, Blanco 440399, Blanco 441471, Silgranit 1 & 3/4 Bowl With Drainboard , The Precis Multilevel sink has two functional work levels; one for the sliding walnut cutting board, the other for the stainless steel colander. Both bowls are 9 1/2" deep. The large bowl's usable size is 17" w x 16 3/4" from front to back. The small sinks usable size is 13" w x 16 3/4" from front to back. The drainer is 15" wide x 16 3/4" from front to back. The total width of the sink is 48" x 20" from front to back. The required outside cabinet space is 54". This is an undermount sink. 80% solid granite, heat resistant up to 536 degrees F. Homogenous and non-porous surface, the color goes all the way through. Resistant to scratches stains and all household acids and alkali solutions. The following accessories are included with this sink: Walnut cutting board, colander (hangs from lower level), Stainless steel grids for both sinks and a 15" drainer grid.