[Specifications]- Twist Drill Bits Diameter: 2mm / 0.08-inch; Drill Bit Length:175mm / 6.89-inch; Shank Diameter: 2mm / 0.08-inch; Total Length: 250mm / 9.84-inch; 4 x Straight Shank Twist Drill Bit [Strength and Hardness]- Made of high-speed steel.