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Permalink Reply by Gary Charnock on March 26, 2015 at 12:16pm

Brad points, flat/speed/spade end which ever name you prefer and auger bits are all good for the job providing you use a sacrifice piece of timber clamped too the underside, auger can be a little aggressive for some as they tend to drag you in, (iv`e started this hole and nothings going to stop me coming through) attitude, but when sharp i feel give the cleanest hole, also Brad and flat bits now come with `spur` sides which scribe the hole before the mane part of the `corkscrew` bit moves in to remove the waste alleviating spelch out and these are usually a little bit dearer but still inexpensive. This is just my opinion and although I am relatively new to CBG building, I have 33 years exp as a carpenter/teacher and these are my preferences, every body finds tools and methods that work for them and as long as the required outcome is there then go with what works for you, but if you can, buy a drill press ;) Alternatively use a small pilot drill bit then drill halfway with the required size bit from either side to avoid breakout. 

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