Using (or trying to) various countersinks on chipboard flooring, most
didn't do much and one that did work got very hot and took about 30s per
hole [1]
Without spending a fortune, are there countersinks that will cut various
materials without setting fire to them? (I have both fluted and 'snail'
type and they're OK on ordinary wood).

Centre punches: could do with something that will handle steel and stay
pointy [2]. Also need pin punches that don't bend too easily.

I've looked at SF and TS; they have largely sets, which I don't mind if
they're good. Axminster's countersinks seem to start at dearish and go to
FO!

[1] Solved it for chipboard by blipping the hole with a slow, 10mm masonry
bit then finishing with countersink. Care needed, as masonry bit really
chews off the surface.

[2] Perhaps a bit unfair using a small punch to unscrew the front plate of
a freewheel, especially starting the wrong way 'til I remebered it was LH!
--
Peter.
2x4 - thick plank; 4x4 - two of 'em.