This Makita HSS TiN Metal Drill Bit Set is ideal for professional use. The drill bits have a titanium-nitride coating, which means they produce minimal levels of friction, reducing friction deposits and keeping the work area clean and tidy without causing damage or staining. The HSS construction ensures these drill bits are suitable for alloyed and non-alloyed steel, malleable cast iron, sintered iron, new silver, copper, bronze and hard plastics such as perspex. The set includes 6 drill bits in sizes 2, 3, 4, 5, 6 and 8mm, all with straight shanks. The TiN-coated drill bits offer longer life and less friction compared to uncoated bits, allowing for faster work. The set comes with a plastic storage case for convenience.