How to measure bit size?

starsky

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Also in Stable Yard, but thought more people might see it in here...

Probably a numpty question :-)
Which part of the bit do you measure to measure the bit width - not length... When they say a bit is 16mm or 18mm, but the bit is wider at the bit rings then tapers to a lozenge in the middle. Which part would you measure to check whether it was 16mm or 18mm?
 
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