Originally Posted by limulus
Yep, I agree. I assume you want to run beer lines through the top to tower. Just buy an appropriately sized hole saw and you'll have no problems.
When you make your holes with the holesaw.........Put a pilot hole through the outer skin, ( metal), all the way through the inner skin, (plastic), using a drill bit of the same size as used with the hole saw, ( usually 1/4 inch).
Keep your drill and pilot hole perpendicular to the skin as you drill through both skins, ( inner and outer).
Then, use your holesaw from EACH side, ( metal skin, then plastic skin), and you'll have a lot cleaner hole.................(That's what she said!......