Dormer A100 Metric 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: 5.50mm. Working length: 57mm. Overall length: 93mm. Dormer A100 Hss Jobber Drill Bit 5.50Mm Ol:93Mm Wl:57Mm in Black