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Product Code: 19676 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=3/4 inch 
D=19.1 mm 
D2=5/16 inch 
D2=7.9 mm 
 
 
 
Grade: TCT 
 
Diameter Imperial: 3/4 
 
Diameter Metric: 19.1 
 
Diameter 2 Metric: 7.9
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