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Features & functions of dowel drill bits & through hole drill bits

Centering point:

for precise positioning upon contact with work piece


  • penetrates lamination layer of coated work pieces
  • cuts wood fibres cleanly when drilling solid timber
  • mainly responsible for quality of the bore hole


  • removes(cuts) work piece material in the area between the center of the hole created by the centering point and the edges of the hole created by the spurs

Spiral/ chip groove:

  • transports the chips outward and provides radial guidance of the drill bit

Through hole drill bits:

  • centering point and raker are one unit