On 16 May, 23:23, Mike Clarke wrote:
If you think you're likely to use many of these the setting tool (12429) is
well worthwhile, If you use a screwdriver to set them they sometimes twist
round making a mess of the plaster as you turn the screw to compress them
but the setting tool gives a clean straight pull.

Seconded - the other aspect is that the screw heads often seem
to be made of cheese, so if you tighten by turning, you've got
good odds of wrecking the head

John