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XI-ON or Super Lock sockets

I got a set of US PRO Super-Lock myself but no chance to use them yet.

Just an observation, the 18 / 19 and 15 /16 are the same outside diameter with the inside machined to the required size which means the wall is thinner on the bigger size.
 
Aren't you looking at it the wrong way round? The wall is thicker on the smaller size.

That is - if they weren't the same OD, then the smaller size would have a smaller OD making the walls the same. :)
 
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