Dormer DORLS600 A110 HSS Long Series Drill 6.00mm OL:139mm WL:91mm The Dormer A110 Metric Long Series Drill Bits is a general purpose long reach drill. Ideal for drilling deep holes in a wide range of materials and are suitable for both hand and machine use. Manufactured to: DIN 340RN/BS328/ISO 494. Tip diameter: 6.0mm. Working length: 91mm. Overall length: 139mm.