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[Bites]
(imgur.com)
Alec (the person who runs this channel) has a habit of rambling on about all sorts of semi-related historical facts and other such nonsense.
I understand if that is not to your taste. I quite like it.
Transvestigators fucking over and possibly traumatising a cis girl over their own paranoia, mostly brought upon by them being sore losers? Impossible. [bursts from extreme sarcasm]
Based and fuck-copyrights pilled.
TL;DW: Specification says that the holes are optional, but they are often used to facilitate the manufacture of the plug blades. It defines a position and size for the holes so that they will be out of the way of the actual part of the plug that makes contact