The IRWIN HSS Drill Bit Hex Shank in 4mm diameter is a workhorse size for everyday drilling tasks across multiple trades. This diameter is particularly suited to medium fixings, clearance holes for standard screws, and general workshop applications. The 4mm size offers robust performance whilst maintaining good drilling control. Manufactured from high-speed steel (HSS), this drill bit provides exceptional durability when working with wood, metal and plastic. The hexagon shank design improves gri
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