My apologies. My drill is actually the DC725 which has a much wider metal section than the DC720 as you can see from this picture (assuming I have been able to get it to work!).
Thanks. As far as I can tell, it is between 41 and 42mm, but I can't be accurate as I don't have a caliper.
Apologies, just cobbled together a 'caliper'. Slightly under 43mm!
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