I think they would work well in hard concrete / concrete blocks or hard brick, however I've only really used them so far in the breeze blocks around my house and they are not much good in a soft material. I've ended up screwing them into raw plugs in the soft blocks, which defeats the object all together.
They do work and work well in all typical internal masonry or concrete materials.
The main use with these, is in fixing for fire safety purposes (eg overhead metal trunking or strapping) as using a traditional plastic plug can mean that the fixing fails in a fire situation and whatever is being held up falls down.
But these are still useful for a quick fixing, and also work in plasterboard.
Pre-drill hard material, but less dense blocks and some bricks don't need drilling.
Hand screw slowly into lightweight blocks, don't use a cordless!
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