Need to countersink holes in CF, which bit do I need?

[brushlessboy16]

Originally Posted by mjderstine

the most common at 82. so unless you got goofy screws you should be fine!

Metrics use 90 degree IIRC

[pb4ugo]

BB16 is right--metrics are 90 and standards are 82. I've had difficulty finding 90 deg countersinks locally, so the best setup I've found is a 90 deg carbide router bit. If only four, you could get away with HSS, but the carbide isn't too much more in router bits.