How do I cut this material to put in a coach light
Go to Home Depot or Lowes or any construction retail store and ask for a "masonry hole saw" that you can put in an electric drill. You can buy any size you want. I checked with my local Home Depot (on line) and got prices of about $25.00 for a 1" and up to $60.00 for a 4-1/8". They can be used for wet or dry drilling in almost any masonry surface. I have used them for cutting holes in both brick and concrete.