Dormer A110 Series HSS Twist Drill Bit, 5.5mm Diameter, 139 mm Overall

HSS Long Series drill for general machining applications up to x6 diameter
Ideal for deeper hole drilling or where a slightly longer reach is required
Steam Tempered finish for improved wear resistance
Manufactured To DIN340 standards

BS 328; DIN 340 RN; ISO 494

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.