The Irwin HSS Pro Drill Bit in 4mm diameter is supplied in a bulk pack of 10, making it an economical option for professionals who regularly use this popular general-purpose size. The 4mm diameter is widely used across construction, metalworking, and joinery applications, particularly for standard fixing holes and general fabrication work. Featuring high-quality HSS steel construction, this drill bit is engineered to withstand demanding professional use. The precision ground cutting edges enable
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