This 5.0mm HSS Titanium-Coated Drill Bits 2PK is an ideal addition to anyone's tools, whether it be for the garden, garage, or DIY. The bits are made of ground twist high-speed steel and are titanium-coated for extended life and fast bit penetration. They are suitable for use with aluminium, steel, plastic, wood, and non-ferrous metals. The product comes with a lifetime warranty for all hand tools and a 3-year warranty for power tools, air & petrol tools.