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12mm, anything much less is liable to bend if you hit a brick
If you hit anything stout enough to bend #3(US)/#10(Metric)/⅜"/9.5mm rebar, you'd be better off moving to one side of it than trying to plough through it with #4
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Cheers.
I didn't realise it came in 3m, but the closest seller to me on ebay cuts to the m for an acceptable price.
gbj_tester
hugo7
@ColinTheBald
I would go with 12mm, anything much less is liable to bend if you hit a brick or whatever as you're whacking it in. You probably know, but it comes in 3m lengths.