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=3/8 inch
D=9.5 mm
D2=5/32 inch
D2=3.96 mm
Diameter Imperial: 3/8
Diameter Metric: 9.5
Diameter 2 Metric: 3.96
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