IRWIN® HSS Pro Titanium Drill Bits designed for drilling metal and harder alloys, as well as being able to produce increased drill speeds of 40%-60% in comparison to the standard bits. With a titanium nitride coating for higher friction resistance and longer bit life. Its 135° split point ensures perfect centring and minimises bit walk, whilst also reducing drilling pressure, giving a more accurate and clean finish. Heavy-duty web construction is designed for optimum strength and durability. This 15 Piece Set contains the following sizes: 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10mm.