I mean, the instructions really do make it look like they want you to drill a 3.2 mm hole in the wall but it’s a ludicrous level of precision for a hole in masonry, that doesn’t even make sense, because you’d be fitting a 3mm plug with 1mm of plastic around a 1mm hole and then driving in a 1mm screw. To hold up a shower screen? Clearly absolute nonsense that would see you wearing the screen/it in bits on the floor
I’d expect more like you use a 5-7mm bit and plug to hold the mounting channel to the wall, then you drill a 3mm hole in the channel and screen edge and screw in a self tapper, after you’ve arranged the screen so that it’s plumb; screens often come with a U shaped channel that goes on the wall first and grips another metal bar running down the side of the screen, to allow the wall to be slightly out of plumb/squate and still mount the screen with no gaps
Because these channels are designed to take out deviations/varying degrees of out-of-plumbness they cannot be pre drilled in the factory
For example:
The yellow highlighted channel goes on the wall first with a larger plug, then the blue highlighted part of the screen is slotted into it, the screen made true and square and then a small hole drilled eg at the red dot location and a screw wound in to stop the screen falling out of the channel
Don’t stress about 3.2mm - get. 3; the self tapper will wind into it fine. Feel free to post a picture of everything that was in the package so we can check
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