Review on Junction Enclosure with Waterproof Plastic for Electronics by Michael Swanson

Unfortunately, when you need to drill holes for switches and indicators on the front of a project box, you usually use large holes (1/2 inch or so ) drill. The flutes of a drill this size dig hard into this plastic, twisting it right out of your hand. How to drill this plastic. Start small. First drill a pilot hole with a small drill and gradually increase the size. I used a step drill which made the job easier. For final drilling with the large drill, run the drill backwards. You get a clean hole and the grooves don't dig into the plastic.