This 4.5mm Irwin HSS TCT drill bit offers precision drilling capability for hardened materials at a mid-range diameter. The 4.5mm size is particularly useful for specific engineering tolerances and applications where standard sizes like 4mm or 5mm don't provide the exact clearance needed. The C2 tungsten carbide tip is engineered to drill through the toughest materials including hardened steel, cast iron, bronze alloys, and manganese alloyed steel, handling hardness levels up to 50 Rockwell C. T
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