Drilling a hole in wood

[thesheep]

So I want to drill some 25mm holes in the top of my desk, to put cables through. The desk is 40mm thick oak. Just wondering what kind of drill bit to buy?

Do I want one of these: http://www.screwfix.com/p/hex-shank-holesaw-arbor-9-5mm/11336 plus one of these: http://www.screwfix.com/p/bosch-cobalt-holesaw-25mm/95168? Presumably that might not cut as deep as 40mm?

Or do I want one of these: http://www.screwfix.com/p/dewalt-flat-wood-bit-25mm/51375 but I'm not sure if that will fit into my drill… it says "Shank fitment suitable for 6.35mm Hex impact driver"… my drill is one of these: http://www.screwfix.com/p/makita-bhp453sh-18v-1-3ah-li-ion-cordless-combi-drill/58614 which says it has a 13mm keyless chuck...

What are the benefits/drawbacks of these different kinds of drill bits?

 

[PrenticeBoyofDerry]

I would use the flat (but at moment it seem screwfix site is down, so cannot view your links). The hex shafts will chuck into your drill.
One tip for a neat hole is pilot first, then drill the hole from both sides, if you go straight through from one side, it will rip into wood on exiting.

 

[foxhole]

25mm is small, better to use a hole saw and fit a grommet.

http://www.hudsonsofficefurniture.c...rommets.aspx?gclid=CNeX99Sit7sCFTDMtAodTyEAxQ

 

[thesheep]

25mm is small, better to use a hole saw and fit a grommet.

http://www.hudsonsofficefurniture.c...aspx?gclid=CNeX99Sit7sCFTDMtAodTyEAxQ[/QUOTE]

Hmm. I thought about it. But it really only needs a couple of USB cables to go through it and a power cable. And they won't get removed often. So a smaller hole seems better. Not too keen on those plastic grommet things.

 

[foxhole]

Fine till you add something with a fixed plug .
Grommets looks better than a hole in your desk.