The Dormer A101 Metric Traditional Flute Ground Jobber Drill Bits are ideal for general machining applications. This HSS drill bit has a left hand spiral and a blue finish (bright below 3mm). Manufactured to DIN 338 LN / BS328 / ISO 235. Specification Flute Geometry: Standard Helix, Left hand spiral. Point Angle: 118°. Material: High Speed Steel.