Dormer A110 Series HSS Twist Drill Bit, 4mm Diameter, 119 mm Overall

Metric Long Series Twist Drill

HSS Long & Extra Long Series

These HSS straight shank, right hand cutting long series twist drills are capable of drilling up to 10x the drill diameter before the flute needs to be cleared, to avoid fouling. They are made to BS328/DIN340 RN and ISO standards, and are recommended for use with steel and cast iron.