Irwin 10502520 HSS Cobalt Drill Bits 4.0mm Pack of 10

The IRW10502520 is a 4mm HSS Cobalt Drill Bit supplied in a pack of 10, making it one of the most versatile sizes for general metalworking applications. This diameter is perfect for drilling stainless steel and high alloy steels in mechanical assembly, fabrication work, and maintenance tasks. The 4mm size is commonly required for standard fixings, brackets, and structural metalwork. With 5% cobalt content integrated throughout the bit, this drill delivers outstanding heat and abrasion resistance, maintaining its cutting edge far longer than conventional HSS bits when working with demanding materials. The heavy-duty web construction provides exceptional rigidity and strength, reducing the risk of breakage during use. The 135° split point ensures immediate cutting action with minimal pressure, reducing bit walk for consistently accurate results. Features and Benefits: • 4mm diameter ideal for standard fixings and general metalwork • Pack of 10 provides excellent value for frequent users