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The CB counterbores are extensively used for recessing bolt and screw heads. Supplied with a HSS slow spiral drill bit. Fully adjustable, a hex key is supplied. TCT version is used for plywood, particle boards and plastics (abrasive). Use a drilling speeds only. Not suitable for ferrous and non-ferrous metals. When setting-up, ensure flutes of drill are aligned with flute of counterbore. For replacement Twist Drills, use slow spiral type e.g 501/532 to 501/012.

Dimensions:
D=1/2 inch
D=12.7 mm
D2=3/16 inch
D2=4.76 mm



Grade: TCT

Diameter Imperial: 1/2

Diameter Metric: 12.7

Diameter 2 Metric: 4.76