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.

Brand Name	Trend
Type	Counterbore Sets
Specification	D=3/4 inch, D=19.1 mm, D2=1/4 inch, D2=6.35 mm
Accessory Type	Drill Bits - Straight
ebay_category	50382