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Product Code: 19677 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. 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=3/4 inch
D=19.1 mm
D2=5/16 inch
D2=7.9 mm
Grade: HSS
Diameter Imperial: 3/4
Diameter Metric: 19.1
Diameter 2 Metric: 7.9
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