The Irwin 4mm HSS Cobalt Drill Bit is an essential size for professional metalworkers, perfect for drilling stainless steel and other high alloys. This versatile diameter is commonly used for M4 clearance holes, general fabrication work, and a wide range of metalworking applications where reliability and performance are crucial. Manufactured from high quality HSS steel with 5% Cobalt content, this drill bit offers exceptional heat resistance and significantly extended life when drilling demandin
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