how to dril big hole in tinny

[northernblue]

The cheap $8 ones from Trade Tools are Bi Metal and work well

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[bilby]

Hi,
You can also get a step drill for about $20 they go from 6mm to about 30mm from memory, they are very handy around the house also and don't block up like a hole saw will when drilling alloy. Handy tip is to use metho as a cutting fluid on alloy, gives a neat finish and stops buildup.
Cheers Bill.