water bottle cage mount bolts

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after reading all the threads about rivnuts i have ordered the tool of evilbay. i will be drilling out the old inserts as they are just spinning in the frame but i have to order some new inserts but have nothing to measure. what is the most common size in mm please



thanks
 

Mark Grant

Acting Captain of The St Annes Jombulance.
Location
Hanworth, Middx.
5mm
 
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