TREND COUNTERBORE 3/16 DIA X 3/8 DC/S
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.
Diameter Imperial: 3/8
Diameter Metric: 9.5
Diameter 2 Metric: 4.76