"Used these in the past for kitchen wall cabinets. They are strong like normal redidrivas, but with the added advanatage of the clamp toggle at the back, which actually works !!
Thee problem with them is that many of the clamp toggles at the back fall off when you insert the screw and tighten it (you can hear them fall off). Out of a pack of 100 i'd say expect 20 or 30 to do this. I found that loosening the toggle before you put them in helps a bit.
Unfortunately, they are only available in packs of 100, which is insane. Should they be available in packs of 10 or 20 then i'm sure more people would buy them. But lets face it how often do you need 100?"
"usable if you pre-drive the screw beforehand & then remove, of the dozen or so l have used so far two broke if they were just driven into the plasterboard & then the securing screw was used. once secured, they offer more security than just the ordinary screw in type."