Twist Drills Set

Twist drill assortments are compilations of twist drills according to DIN 338 in plastic boxes from 1mm up to 13mm, partly with tap hole drills. 

Those are required for bores in which a metric internal thread should be cut.

The sets are offered in different quality levels: roll forged twist drills made from HSS steel (HSS-R), fully ground twist drills made from HSS steel (HSS-G), either with a bright finish or TiN (titanium nitrided) coating and fully grounded made from HSS Co material (HSS-E).