FAST DRAINAGE & EASY MAINTENANCE: Rear drainage hole design increases the usage space of the cabinet under the sink. 21 CM for soaking, scrubbing or washing large pans and pots easily. Double slide rails: The inner wall of this undermount kitchen sink features double rails that can be placed on the sink accessories to slide at will and utilise the workspace efficiently, our accessories solid wood chopping board and.triangular drainer baskets can be placed on the slide rails to form different work areas.