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In reply to Post #14
Not quite correct, there are 12 sided bolts around. Normally for special uses but I’ve come across them a few times on flywheels, big end bolts etc.
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In reply to Post #18
BTW I'd say the set in post #1 is average depth rather than shallow and should be deep enough for the nuts and bolts I'm likely to come across.
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In reply to Post #15
Don't drive tight nuts from the corners, drive them from the flats. Don't use a shallow socket on tight nuts, use as deep as the depth of the bolt head, minimum. Or you'll create rounded and damaged bolt/nut heads. Surface area 
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In reply to Post #16
Thanks
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In reply to Post #15
No, perhaps I didn’t explain my reasoning well enough.
I meant a 12 sided would be easier to fit onto a good hexagonal bolt or nut.
12 sides would give you double the chance of dropping on the hexagon of a bolt/ nut so on average you would only need to rotate the socket half the angle for it to align with the nut / bolt. Especially useful if you are using a breaker or T bar in a restricted space.
With a 6 sided you need to align it perfectly for it to drop on.
As you said in your second statement a 6 sided socket provides more contact area so better for strength.
The one with rounded corners just drives on the flats so works even if the nut/ bolt corners have been destroyed.
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So a 12 sided socket is better for worn nuts and bolts?
But a 6 sided socket is better in that with more contact area it can apply more force?
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In reply to Post #12
Better at what?
You don't come across 12 sided bolts/nuts. A socket is the contact to the object you're about to introduce a force through. Greater the force the better a larger surface area contact. The same way you'd use the open end of a combination spanner on a tight nut. Or end up with bleeding knuckles
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In reply to Post #12
I Never given it much thought but the only things I can suggest are as follows.
1.The 12 sided socket would justify its existence in that it would be easier to fit to a bolt head than a 6 sided.
2. Both the 6 sided sockets drive better but the tooling to make straight sides would probably be cheaper to produce than that for curved sides, thus the two types of 6 sided.
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In reply to Post #11
I've got mine. I hope I don't need them in a way, means I've not come across a problem
If these sockets are better can someone tell me why all sockets are not made this way?
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In reply to Post #6
i did buy these, and for the same reason and sump bolts etc, i have not used them yet, but for the price if they work once, then im ok with that
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In reply to Post #9
Ordered
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In reply to Post #8
I guess it depends on how much heavy work you will be doing. 3/8 will suffice for most home enthusiast's but half inch might be a better option if you've got heavily rusted or larger stuff to undo. For the price in the op link looks a steal, Bergen used to do pretty decent tools back in the day so if quality hasn't slipped you might be onto a winner
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In reply to Post #7
Thanks at the price I think I'll get them. Might come in handy one day
Edit
Or maybe I need 1/2" drive?
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In reply to Post #6
They were designed for rounded off bolts...
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In reply to Post #1
Did you buy these in the end and are they any good for nuts and bolts that are slightly rounded?
I struggled with some exhaust clamp bolts a couple of years ago, maybe these might of helped.?
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NON Carp stuff