[Specifications]- Twist Drill Bits Diameter: 1.5mm / 0.06-inch; Drill Bit Length:100mm / 3.94-inch; Shank Diameter: 1.5mm / 0.06-inch; Total Length: 160mm / 6.3-inch; 6 x Straight Shank Twist Drill Bit [Strength and Hardness]- Made of high-speed steel.