how big a hole for gommets?

Imitation said:
I'm looking at getting some of these to route my tubing out the back of my case. http://www.petrastechshop.com/3id13odrugr.html

And I looked at lowe's and they have holesaw sizes all the way down to 3/4in. Which size holesaw should I be using for them?
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Don't get a saw that will be the exact diameter of the outer side of the saw. The groove will match the inner area so I would get something like 1" to start off with. If there is a stepping that is slightly higher than that get that one. It's easier to file the edges down a little than have a hole that's too big for your grommets.
 
Performance-pcs and Frozencpu have multiples of grommets, I usually base the grommet on the size of my hole saw; not the other way around.

Decide what size hole you're going to drill, then order the grommets; they are cheap, so I usually get 4 of the "right size" and then 4 of a size just a scootch bigger.

I've also found if you cant get a size you need, or want to cut a rectangle, molding rubber or Lian-Li edging works very well.
 
In the specifications for the grommet, they will have a size for the hole...

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That's from McMaster-Carr's website. The hole size is 'E'.
 
get a step bit like this: http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96275

Makes a nice smooth hole... like it was professionally done.

Just keep going in until they fit snugly. This is what I did using the same gromits from petra's but I forget what I ended up at hole size wise.

Word of warning though, if you buy the bits at home depot you're gonna be spending like $50.
 
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