The Milwaukee Metric HSS-G THUNDERWEB Metal Drill Bit design is unique, with a conical shaped web which gets thicker towards the back of the drill bit. It has a parabolic web cross section that gives a larger web thickness increasing the strength of the bit, and prevents breakage. The THUNDERWEB flute form ejects hot chips rapidly, dissipating heat better, increasing the life span and working time. The open flute form also reduces drill drawback, especially when drilling deeper holes. The 135° split point allows for precision starting, quick penetration, and requires less effort and feed pressure, and is perfect for drilling very hard materials. They are also great for drilling on curved surfaces. This 19 piece set contains one of each of the following: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 10mm. The Milwaukee 19 Piece Thunderweb HSS-G Metal Drill Bit Set delivers exceptional strength and durability for demanding metal drilling tasks. Featuring a robust conical web design and advanced flute geometry, these bits offer superior heat dissipation and extended life. Housed in a tough, impact-resistant ABS case, they ensure safety and convenience on the job. Features and Benefits: Thunderweb conical design for enhanced strength, Parabolic web cross section provides built-in durability, Rapid chip ejection and heat dissipation extends tool life, 135 split point for accurate, slip-free starts, Polished finish reduces friction and wear, Accepts higher torque and feed pressure with less breakage, Supplied in a protective ABS case with reinforced corners. Contents: 1 / 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 4.5 / 5 / 5.5 / 6 / 6.5 / 7 / 7.5 / 8 / 8.5 / 9 / 9.5 / 10 mm.