There are many different kinds of cutting tools, and each is designed to excel at a specific type of task. Apart from determining which style is best suited for your work, you should be aware of the quality of the bit, which can affect not only the hole itself (concentricity, smoothness, etc), the working life of the bit, and whether it will even cut the material you are working on. Higher quality drill bits will typically be more expensive than lower quality bits.
How do select the drill bits?
The general quality of the steel (hardness, alloy content)
The machining of the grooves (if any) and the cutting edges
The roundness of the bit (it should be perfectly round)
Quality concerns aside, you should, whenever possible, use a drill bit suited for the work you are doing. For example, despite the fact that most people use them for this purpose all the time, standard twist bits are not designed for drilling screw holes; taper point bits are, and they do a much better job since they leave enough material on the sides of the hole to allow all the screw threads to bite.
“The Last comes first,” as we shoemakers say. For the uninitiated, lasts are the forms that one makes the shoes or boots on. A representation of your feet – sort of – including style lines, heel height, toe-shape, attitude. The most essential and trickiest part of the whole job. In my line of work, it all starts here. The shoes can be lovely, but if they don’t fit properly, they won’t last, they might cause hurt and can damage the feet. As the lasts are made or adapted to the specifications of each individual client, they are beautiful in their uniqueness of lines, curves, character. Each last has its own story to tell. It is a hard-earned skill to understand how measurements, tracing, and movement plays together. Once again, experience through trial and error, learning from skilled craftsmen, and not giving up marks a successful maker.
Whatever bit you ultimately choose, let the tool do the work for you. If you have to use excessive pressure to cut, then the bit is dull and should be re-sharpened or replaced right away.
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