The person fitting them was impressed with the product also having the steel thread which sits in the wall plug for the additional support.

however I’m going to give these fancy things a go just so I know how they work for the myriad of different tasks I’m going to face on these walls around my house! For heavier stuff I use Corefix, these go through the plasterboard and right into the solid wall with an internal strengthening collar to bridge the gap. Metex have removed the guesswork from choosing a fixing by offering a ‘fixing or hook for every application’.The commonly used rawl plug and screw is a classic example, but for a more secure and safe fixing the Corefix solution is hard to beat. As written it is not appropriate for heavy loads on dot-and-dab walls, and with respect to them taking the effort to post and meaning well with it I suspect they haven't actually implemented the method all that often in practice.

I used the Corefix fittings while mounting a uni-strut to support a low loss header and I was impressed. Each wall plug has enough depth to fill the gap between plasterboard and wall to transfer the load to the brick wall behind for a safe and secure hold. Based on the UK definition of a hollow wall, then a hollow wall anchor would be a fixing that secures a load to a hollow or cavity wall. But as the term "hollow wall" has started to become used to describe what is more accurately a dot and dab or stud wall, then the term hollow wall anchor has also become extended to cover rawl plugs as well.

Made in Britain, Corefix wall plugs are independently reviewed to ensure a safe and secure hold no matter the fixture. Developed with installation speed in mind, each three part set can be fitted in less than a minute with no specialist tools required. Independently tested and certified: Made in Britain, our wall fixings have been independently strength tested, verified, and certified to ensure a strong, secure, and safe finish, making them a top choice for modern homes. I only used them on medium weight items, not on rads/boilers yet, but I’m sure they’ll be up to the job. Fischer DuoPower and the blue coloured Rawl 4 All both spring to mind… Have I just outed myself as a wall plug nerd?