Which Dremel bit?

I need a dremel bit to modify my alloy frame cable bosses (enlarging the apertures for both gear cables and the rear brake hose), but I haven’t got a clue which one.

Looking at their website, the 3.2mm Silicon carbide grinding stone looks like it’d do the job, can anyone here confirm this or avise an alternative?

cheers

No idea on the dremmel attachment but on a previous frame I used a 5mm metal drill bit and a cordless drill.

I’ve seen this go horribly wrong! 😀 well, made me laugh anyway. Weren’t my bike though.

Carlos’ suggestions sounds like a good idea. You’re only trying to grind a tiny bit of metal off really. Why aren’t the existing guides not wide enough?