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BUILT FOR HARD STEEL: Made from M35 cobalt high-speed steel with about 5% cobalt for HRC 63–66 hardness and strong heat resistance. These cobalt drill bits cut stainless steel, alloy steel, and other tough metals with less dulling under heat. 135° SPLIT POINT STARTS CLEAN: The self-centring 135° split point tip helps stop walking on metal so you can start accurately, often without a pilot hole, and keep holes clean on hard surfaces. ONE SET, MULTIPLE MATERIALS: Built for stainless steel, cast iron, alloy steel, and titanium, and still useful on aluminium, copper, plastic, and wood for garage, workshop, and jobsite drilling. 27-PIECE PROFESSIONAL SET: Full size range 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0×2, 5.5, 6.0×2, 6.5, 7.0, 7.5, 8.0×2, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 13.0 mm so high-use sizes stay available without downtime. COOLER CUTTING, ORGANISED STORAGE: Fully ground twist design with dual flutes clears chips quickly to cut friction and heat. Hardened by high-temperature quenching. Ships in a sturdy case for organised storage.