This 4.2mm Faithfull Professional Cobalt Jobber Drill Bit is supplied in a convenient pack of 2, offering a specialist size for specific engineering and fabrication applications. The 4.2mm diameter is commonly specified for metric clearance holes and pilot drilling operations where precision is paramount in hard materials. Crafted from M35 HSSE grade steel with 5% cobalt content, this drill bit provides outstanding heat resistance and extended tool life. The cobalt additive enables the bit to wi
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