Have heard about screws that you drill a pilot hole and screw directly into
a concrete floor - no raw plug so ideal for fixing floor boarding, skirting
and the like.

But I can not find them in either Toolstation or screwfix in less that 75mm
lengths - all described as for frame fixing.

I only want to fix 22mm floorboards to a concrete floor so am looking for
something about 45mm or so.

Any suggestions?

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Mark BR