michael adams wrote:

Most woodscrews on sale nowadays are pozidrive. In order to buy and
use woodscrews in the future, you'll need to buy a pozidrive screwdriver.
You'll most likely only need a number 2 as this fits all screw sizes
up to 10 (4.5mm). No 1 fits mainly screws on electrical fittings etc while
no 3 fits very large woodscrews or mainly pozi heads on things like
M6 machine screws.

No. 2 Pozi fits up to 5mm screws in my experience, certainly all the
Screwfix 5mm screws I have are no. 2 pozi. It's 6mm and up that are
no. 3 pozi.

--
Chris Green
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