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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. 5-PIECE BASIC DIY SET: Includes the most used sizes (3 mm, 4 mm, 5 mm, 6 mm, 8 mm) for everyday repairs and DIY metalwork; no unused extras, just the diameters you reach for most. 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.