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Drill bit geometry has several characteristics: The spiral (or rate of twist) in the drill bit controls the rate of chip removal. A fast spiral (high twist rate or "compact flute") drill bit is used in high feed rate applications under low spindle speeds, where removal of a large volume of chips is required.
Flat Bottom Boring Bits. General Description: Flat bottom boring bits are similar to counterbores but do not include a center drill. These bits are designed to drill flat bottom blind holes for European style hinges, etc. Flat bottom boring bits are also used for drilling large diameter thru-holes without the plug that is typical when using a ...
It is sometimes critical that the "drill bit" you choose is the proper type for the job. You can often use a higher quality tool for a lower difficulty job, but doing the opposite can lead to tool failure, ruined parts or even personal injury or worse.
19th century drilling tools: Milles Fall Home Page (Old Tool Heaven) by Randy Roeder. General information as well as a description and picture of every Millers Falls drill tool ever sold including one-hand operated push drills which I have ignored here.