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=1/4 inch
D2=6.35 mm
Diameter Imperial: 1/2
Diameter Metric: 12.7
Diameter 2 Metric: 6.35
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