Going to screw studs into Leca, what is the screw that bites called?

[Workingclasshero]

I have tried a special screw that you can attach things with in Leca. But what is it called?

Maybe there are more, suggestions?

 

[Johan Gunverth]

Lightweight concrete screw?

 

[Peter2400]

Lightweight concrete screw

Like this for example: http://www.byggmax.se/spik-och-skruv/ovriga-skruvar/lattbetongskruv-p24376

 

[Workingclasshero]

Ahh, that's what it's called, of course.
Thank you, and excuse me for my laziness... or laziness and laziness, the day has been spent putting on 4 snow chains on the tractor, and now I've run out of fuel.
Firmadetgårbranu AB