RUKO HSS Jobber Drill bit

RUKO HSS Jobber Drill bit 

High-performance rolled, steam-treated twist drill made from heavy-duty high speed steel. The manufacturing procedure (no structural disruption) solidifies the material making it more elasticated. This makes it more resistant to fracture and suitable for robust drilling units (e.g. hand-held drilling machines). 

Material  HSS-R
Surface  Black surface
Cutting direction right-hand cutting
Shank  cylindrical
Drilling depth 5 x D
Point cut Shape N: Helical point normal ground
Point angle 118°
Helix angle 25-30°
Tolerance h8