Sponge Holder for Top Mount Kitchen Sink

Dimensions are in the photos. Very simple but very useful.
Kitchen sink is similar to this one http://www.homedepot.com/p/KOHLER-Hartland-Self-Rimming-Cast-Iron-33x22x9-625-4-Hole-Kitchen-Sink-in-White-K-5818-4-0/202550265?N=5yc1vZarsaZ1z10i2e