These should expand / contort when screwing in, the secure to the back of the plasterboard. Emphasis on ‘should’.
In my experience, they are flimsy at best and fail at worst.
If you’re installing shelving (assuming you’re putting heavy things on them) I would go with hollow wall anchors (don’t forget to buy a setting tool…).
If these are external walls or internal supporting walls, you’ll lively have dot and dab which means the space between the plasterboard and brick / breeze block will be small. You should drill into the brick to accommodate the tail of the anchor.
These should expand / contort when screwing in, the secure to the back of the plasterboard. Emphasis on ‘should’.
In my experience, they are flimsy at best and fail at worst.
If you’re installing shelving (assuming you’re putting heavy things on them) I would go with hollow wall anchors (don’t forget to buy a setting tool…).
If these are external walls or internal supporting walls, you’ll lively have dot and dab which means the space between the plasterboard and brick / breeze block will be small. You should drill into the brick to accommodate the tail of the anchor.