Instructables

Illustrated & Detailed Guide To Making A Fire Piston

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Step 4: Full Sized Tinder Hole

Picture of Full Sized Tinder Hole
With the pilot hole drilled you can now proceed to drill the large hole. A number 31 bit seems to be about the right size. Notice how there is still a bit of material left between the hole and the piston end. If you don't leave a little room the drillbit could slip out!
 
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what size is a 31 dill bit