this post was submitted on 23 Mar 2025
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Mildly Interesting
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I am a complete amateur, but the box fits my experience.
If you use same size drill as the plug, the whole will be too big, and the plug is not fitting tight and firm enough, so the screw will just rotate the plug in the whole.
Especially in old brittle cement and "mortar" you need to be careful not to use too big a drill.
"Mortar" as the cement like material used when building a brick wall. I hope I'm using the correct word.
This might be true for some cheap brands, but it's certainly not true for any of the tens of thousands of plugs I've installed over my career. The plug diameter indicates the hole size you need to drill - 6mm hole for a 6mm plug, 8mm hole for an 8mm plug, and so on. The instructions here simply cannot be correct, as 6mm and 8mm plugs require different-sized drill bits, yet the packaging only mentions a 5.5mm bit. The only exception I can think of is concrete screws that don't need a plug: 6mm is correct for concrete, but for more porous materials like cinder blocks, you use a 5.5mm bit.
Judging by the fact that people in this thread are finding translation errors in the text there I'm assuming that's what has happened with the measurements too.
Here's the instructions for 6x30mm Fischer DuoPower Plugs for example.
I only see length on that box???
Also the image shows th plug sticking out, and as (2)40 mm, with something else that is unclear to me as (2)35mm.
Personally by the quality shown, the illustrations are useless to me.
The plug is 6mm meant for 4-5 mm screws, there is no indication of drill sizes that I can se.
There is also a measure on the right of (2) 12.5 mm which is completely unclear what is for?
I don't see how the image supports your point?
Rawl brand have these notes on the plastic, which I think is neat.
Brown plug, 7mm hole, 5-6mm screw.
Even a little gauge to go with it.