I used a 1" drill bit that looked like a giant regular bit. I couldn't afford to pay $50 bucks for a 1" step drill bit. Would have been nice, but thats a lot of cash. The big cartoon looking bit was $11. It got the job done.
Performer, UDS, 2011 WSM, Frank-in-Weber, 120 Gallon Offset, IQ-110, ET-732