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Message: <blockquote data-quote="Moe Lester" data-source="post: 5677437" data-attributes="member: 551478">When predrilling I usually would go just barely deeper than the screw will go. Always countersink your screws. As for the size of the bit a 3/32 or 1/8" will work fine, just hold it up next to the screw and see that the bit size is smaller than the shank of the screw by just a very very tiny bit.If you are cutting a hole with a rotozip i would imagine you need to make many passes that are not very deep since the bits are only 1/8" diameter. If you are using a router I would go with 3 or 4 passes ~1/4" deep each using preferably a spiral up cut bit or a straight bit if you dont have the spiral.Which bit are you using in the rotozip?</blockquote>

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