Dormer A100 series general purpose HSS jobber drills are suitable for use in the majority of general purpose engineering applications. They have good self-centring capability on a wide range of materials and are suitable for both hand and machine use. DIN338RN BS328 ISO235 Tip diameter: 17/64in. Working length: 69mm. Overall length: 109mm. Dormer A100 Hss Jobber Drill Bit 17/64In Ol:109Mm Wl:69Mm in Black