Drilling size for DC jack?

[soggybag]

Does anyone know what size drill bit to use with these DC jacks?

http://www.smallbearelec.com/Detail.bok?no=93

I was thinking about buying a Unibit. There are two varieties, one is stepped in 1/16ths. The other is stepped in 1/32ths. The lip in these jacks is pretty small. I'm worried that 1/16ths might be too great a step.

[sfx]

Ohhh, just drilled a hole for one of these last night... It's 1/2" and the largest step on the Unibit I have as well.