Dave, I did the same thing. I went and got granite sink cutouts. He gave me all I wanted. He had a pallet full so I backed up and took what I could load. I got maybe 20. I took my wet saw and squared them up and got them to about 16 inches square. I’ve not broke one yet if I do I have 19 more to go. I put mine on a rubber mat to protect the bench also help absorb the shock. It’s a very dense mat made for cutting on.