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For most non-critical work in Design and Technology, countersinking can be achieved using a Twist Drill twice the diameter of the hole in question.
Combined Countersink, Pilot Drill and Counterbore drills can greatly speed up assembly work in wood.
For more precise work, purpose made Countersink Bits are available.
Choose High Speed Steel if countersinking steel since ordinary Carbon Steel is suitable only for wood and plastics.


Draper Hand Countersink Bit	Countersinking Drills	Combined Countersink, Pilot Drill and Counterbore drills

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:26, 29 October 2015		404 × 394 (28 KB)	DT Online (talk \| contribs)	Countersink Bits

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