Drop In Bathroom Sink With Granite Countertop . Both overmount and undermount come in a variety of materials. From drop in bathroom sink with granite countertop, source:menards. Drop In Bathroom Sink With Granite Countertop Drop in bathroom sinks from www.pinterest.com Customcraft countertopsâ® 37″w x 22″d blue flower granite high. Do not forget to apply the caulking to make a waterproof sealing. Click to see full answer.