| 1. | Twist drill bits are available in the widest choice of tooling materials.
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| 2. | "Long series " drill bits are unusually long twist drill bits.
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| 3. | Twist drills are designed for boring holes in metal and other hard materials.
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| 4. | Another version of the spiral point plug tap is the spiral twist drill.
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| 5. | Conventional twist drill bits tend to wander when presented to a flat workpiece.
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| 6. | Twist drills are sold singly or in sets.
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| 7. | In 2007, Dormer merged with Precision Twist Drill and Union Butterfield in US, Canada and Mexico.
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| 8. | Regular twist drills or straight fluted drills have 2 lands to guide them through the hole.
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| 9. | Annular cutter is a substitute for slower, more expensive and less efficient Twist drills and Hole saws.
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| 10. | Metals are typically isotropic, and an ordinary twist drill bit shears the edges of the hole cleanly.
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