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Spot welds - recommended drill bits ?


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Hopefully over the Christmas period I'm going to start gutting the rear of my car out, ready for a half/roll cage to be welded in next year at some point.
And I'm just wondering for those that have done any spot weld drilling, what bits you used ?
I see very mixed reviews on the little 8mm cutters with teeth, and would rather buy what works.

Cheers for any help !

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Looks like we get things like this but quality varies (of course):



I know sometimes places like Machinemart/Screwfix etc sell stuff that looks the same but I've found that the quality is better with some stuff:



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