"Having used other cheap or branded wall plugs that didn't like anything other than solid brickwork I thought I would try the Fischer plugs and bought the Nylon Plug Assortment Box, Product Code: 28858. I found these to be a great purchase as it had a wide range of plugs for different screw sizes and wall types (aerated blocks etc). Having used up all of the 8mm plugs I had no hesitation in buying a box of these. They fit nicely into the drilled hole and take and hold the screw firmly, instructions on the packet are clear and each plug also has the key drilling/fitting instructions on the side. They are slightly more expensive per plug but I have not had one fail yet."
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Review 6 for Fischer Fischer SX Nylon Plugs 4.5-6 x 40mm Pack of 100
"I get through loads of these, they are so much stronger than run-of-the-mill plugs. 6mm for medium weight picture/mirror/small cabinet mounts and 8mm for heavier stuff. 10mm and larger are seriously strong and will take heavy loads.
The collar makes a neat finish and stops the plug pushing too far into the hole...screw penetration should ideally be into or beyond the far end of the plug to pull it back causing further expansion (using low clutch slip setting on driver or final tightening by hand to avoid stripping the nylon and ending up with no grip).
They aren't cheap but far less expensive than getting called back to redo the job because the plugs weren't 'man enough' for it!"