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The Irwin Cobalt Drill Bits PK3 set includes 5 precision crafted drill bits, designed for industrial and commercial applications that require extreme durability in tough materials. With sizes ranging from 1/8-inch to 2-3/4 inches, this set delivers superior performance in steel, stainless steel, cast iron, copper, brass, and plastic. The proprietary alloy material enhances heat resistance for longer life, reduced breakage, and quicker drilling speed. From professionals to DIY enthusiasts, these cobalt-infused drill bits offer incredible value, efficiency, and precision for all your drilling needs.