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  1. A twist drill is a metal rod of a specific diameter that has two, three or four spiral flutes running most of its length. Two-flute drills are for primary drilling, whereas three- and four-flute drills are only for enlarging cast or punched holes in a production situation.
    www.rockler.com/learn/twist-drill-bits
    The most popular type of drill in use today is the twist drill. It was basically formed by twisting a flat piece of tool steel longitudinally for several revolutions, then grinding the diameter and point. Currently, twist drills are manufactured by two machining spiral flutes or grooves that run lengthwise around the body of the drill.
    www.theengineerspost.com/twist-drill-nomenclature/
    Twist drills are rotary cutting tools that normally have two cutting edges and two flutes which are grooves formed in the body to provide cutting lips, to permit the removal of chips and to allow coolant or cutting fluid to reach the cutting action. They are identified by the: Shank style - Straight or Taper
    www.regalcuttingtools.com/products/twist-drills
     
  2. Best Drill Bits for Metal - Pro Tool Reviews

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