Dormer R454 Series Solid Carbide Twist Drill Bit, 3.9mm Diameter, 66 mm Overall

The Dormer Force X long drill bit is a high performance drill bit. This drill bit able to produce high quality and accurate holes at high speeds and feeds. This drill bit has self centring 140 degree, 4 facet split point and CTW flute construction for enhanced penetration rates. Titanium aluminium nitride coating increases surface hardness and improves tool life.

DIN 6535 HA cylindrical shank
Supports DIN 6537L standards
Continuously thinned web flute design
5xD Usable tool depth to diameter ratio
M7 Industry standard tool tolerance zone