Taking a Core Sample

I needed a way to drill a 3/8″ to 1/2″ diameter hole in 2″ thick rigid foam. Traditional drill bits wander too much and leave a terribly ragged hole. So do spade bits. A hole saw works great, but the smallest I could find was 3/4″. So… I tried a Grain Belt Models 36″ HO-scale culvert. I think the results speak for themselves!

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