Dormer A920 Series HSCo Twist Drill Bit, 4mm Diameter, 55 mm Overall

HSCo high performance Jobber length drill for machining deep holes in most materials up to x3 diameter.

Parabolic flute design enables rapid chip evacuation
Allows greater drilling depths without the need for 'pecking'
130° special point geometry for excellent centring capability and reduced thrust requirements
Thicker web design gives increased structural strength resulting in a much lower risk of drill breakage
Manufactured to DIN1897 standards