This is the best size to use for threading the mandrel and stoppers into the wood. It has a 1 3/4" flute length and the total length is 3 1/16". The standard wood bit is longer and tends to wander if it hits a tight wood grain.

5 5 2 Product
$4.50 each

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The stubby bit results in virtually no deflection of the bit when drilling the hole in a bottle stopper. Accordingly, the result is a well centered hole into which to mount the blank to the bottle stopper mandrel.
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I am pleased with the drill bit, it is just what I was looking for. The rapid delivery was very much appreciated, Ruth said 2 to 3 days and I thought, "yeah right, I'll see it in a week or so." Two days later it was in my mail box. Thank you. Great system.