Feature:1. COBALT HIGH SPEED STEEL: Made from premium cobalt steel, this drill bit has excellent heat resistance and good toughness, making it effortlessly cut through metal like butter.2. HIGH TEMPERATURE QUENCHING: The high wear resistance and hardness of this drill bit are achieved through a high temperature quenching process, ensuring its durability and long lasting performance.3. DOUBLE BACK ANGLE BLADE OPENING: The double back angle design makes the drill bit sharper and faster, improving chip evacuation and drilling speed.4. 24H SALT SPRAY TEST: This drill bit is resistant to rust and corrosion, even after prolonged use. It maintains its durability and superior performance over time.5. HIGH CONCENTRICITY STRAIGHT SHANK: The drill bit features a high concentricity straight shank that ensures a secure fit and prevents any looseness, even during heavy duty applications or accidental impacts.6. COMPATIBILITY WITH VARIOUS EQUIPMENT: This twist drill bit is compatible with a wide range of chuck types and can be used with handheld drills, cordless drills, impact drills, bench drills, magnetic drills, and more. It is a versatile tool suitable for different drilling needs.Specification:Item Type: Twist Drill Bit KitMaterial: High Speed Steel with CobaltHardness Rating: 8AWear Rating: 5 levelBit Sizes: Approx. 1mm / 0.04in, 1.5mm / 0.06in, 2mm / 0.08in, 2.5mm / 0.1in, 3mm / 0.12in, 3.5mm / 0.14in, 4mm / 0.16in, 4.5mm / 0.18in, 5mm / 0.2in, 5.5mm / 0.22in, 6mm / 0.24in, 6.5mm / 0.26in, 7mm / 0.28in, 7.5mm / 0.3in, 8mm / 0.31in, 8.5mm / 0.33in, 9mm / 0.35in, 9.5mm / 0.37in, 10mm / 0.39in, 10.5mm / 0.41in, 11mm / 0.43in, 11.5mm / 0.45in, 12mm / 0.47in, 12.5mm / 0.49in, 13mm / 0.51inPackage List:1 Set x Twist Drill Bit(25Pcs)1 x Storage Box