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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.
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Alternatively you could also fix through the PB to the brick, use big plugs and a 6mm screw
The head shape is probably just cosmetic -
What type of shelving is it? If the brackets can work with it, as above I would try to get the plug in to the brick behind the plasterboard and use that to take the weight rather than the plasterboard itself. If that's a no go, hollow wall anchors are good (as above, again), but they are long, so you will need to drill out some of the masonry behind the plasterboard.
Dot and dab is a shit show really isn't it?
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Installing string shelving onto plasterboard walls, attachhed is photo of the screws and plugs they supply
2a. do i need shorter screws with matching head shapes to the provided ones?
2b. do i need to drill the brick behind and use the provided ones?
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