Trend CB12-316HSS 3/16 drill diameter x 1/2 counterbore 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.
|Specifications||D= 1/2 inch D= 12.7 mm D2= 3/16 inch D2= 4.76 mm|