Kango HSS Drill Bits are designed for drilling into metal, plastic, and wood materials. This 19 Piece Set includes Drill Bits ranging from 1mm-10mm in size. The tip of each drill bit has four cutting chamfers. These cutting chamfers provide maximum material contact, delivering faster drill speeds and cleaner holes in metal. A 135° split point on the tip prevents the drill bit from wandering on startups. This feature ensures more precision and faster startup speeds. The tapered core provides additional strength and structural support to prevent bit breakage. While drilling through materials, the variable flute shape rapidly ejects chips and material. This rapid eject action contributes to faster and more efficient drilling.