It is possible to drill through an engineered stone countertop, but it requires specialized tools and techniques. Here are the steps you can follow:

1. Get the right tools: You will need a diamond-tipped drill bit and a drill with variable speed control.

2. Mark the spot to be drilled: Use a pencil or marker to mark the exact spot where you want to drill a hole.

3. Secure the countertop: Place a piece of plywood or scrap wood on the underside of the countertop to prevent chipping, and use clamps to secure the countertop to a workbench or table.

4. Apply water: Use a spray bottle or wet rag to apply water to the surface where you will be drilling. This will prevent the drill bit from overheating and damaging the countertop.

5. Begin drilling: Set your drill to a slow speed and start drilling at a 45-degree angle. Use light pressure and avoid pushing too hard as this can damage the countertop. Keep the drill bit lubricated with water throughout the process.

6. Gradually increase the speed: Once the drill bit has started to bite into the countertop, you can gradually increase the speed of the drill to create the desired hole size. Be sure to keep the surface wet at all times.

7. Clean up: Once you have finished drilling, wipe away any excess water and debris with a clean, damp cloth.

Note: It’s always a good idea to practice on a small piece of scrap material before drilling into your actual countertop.