On 22/01/2019 12:48, Jeff Layman wrote:
I am replacing some old wall lights with some new Där fittings. I was
somewhat surprised to see that the wallplugs and screws supplied were of
different lengths. The wallplugs were 25mm x 5mm, and the screws 35mm x
3.5mm. The diameters match well, but why would you use a 35mm screw with
a 25mm wallplug?

Is the object being screwed to the wall 10mm thick by any chance?

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Regards,
Martin Brown