On Thu, 19 May 2005 16:13:21 +0100, Bill Woods
wrote:

But now I am tending to prefer these Supadrive/Pozidrive headed
chipboard screws.

What's a "chipboard screw" ? If you mean the Screwfix Goldscrews (if
they're still available), then they're perfectly adequate on anything. A
_real_ chipboard screw though has an even finer pitch, usually by being
a twin start thread (Screwfix's Quicksillvers). These are OK for most
timber, but you'll get problems with the softest ones, such as western
red cedar or hemlock.

The ones to avoid are drywall or plasterboard screws. They're brittle.