I have a Yihua 936 which uses the same attachments as the more popular irons of this type. Other nibs I've bought in the past have fit without issue, but this one was (barely) too small for it. After a few minutes of wrapping the drill with sandpaper I was able to set it up properly. I believe mine had a hole that was too small, not that it was a compatibility issue with my hardware. The inserts appear to be normal, although the size is not right for my application (Voron v2.4 3D printer assembly). They seem to need about a 4mm hole for a proper fuse. The 4.5-inch holes in my review unit were too big and didn't grip the insert well enough.
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