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The Faithfull Professional Pre Pack Metric HSS Jobber Drill Bits are designed to meet the requirements of the professional user, these pre-packed drills are manufactured from M2 grade steel and are fully ground to meet the standard of DIN 338 and feature a 135° non-slip split point. Suitable for use in: Alloy steels, carbon steels, cast iron, hardened alloy steels and stainless steels.The FAIPP420PRO Professional Jobber Drill Bits have the following specifications: Diameter: 4.2mm. Pack quantity: 2.Additional Information:• Tip Diameter (mm): 4.2• Working Length (mm): 43• Overall Length (mm): 78• Pack Qty.: 2