I bought a new black granite sink. I put it in, which is a hassle and takes a bit of time. I then noticed that the sink had a very small hole in the back inside which did not go entirely through the sink. It was likely just a bubble in the granite mix that came to the surface and remained unseen until it got to me. The hole was about a quarter of an inch in size. I didn't want to take out the sink and replace it for two reasons: one it is a lot of work and two it seems like such a waste of materials in the environmental sense.