Hi David,
I take it you are asking about drilling the insert plate for the table to accept your router?
If so I presume it's a phenolic (or whatever they call it) insert plate?
When I drilled mine (Axminster) I used a small drill for a pilot hole and for greater accuracy and then drilled through once again with another drill to finished size, which for my router was 5mm holes to accept 4mm screws for a Makita.
I just used ordinary hss jobber drills, everything went without a hitch.
Hope that helps.
ps. I used a board underneath when drilling to support the plate with the hope of preventing any surface breakout.