It is a Hand Tools/Wood Tools/Hand Drill. Chuck Diameter: 0.4”. Size: overall 0.6"x 4.8”. Material: CNC Aliminium Alloy Hand Drill & High Speed Steel Twist Bits. Application: Mainly used for Model, Resin, Jewelry, Walnut, Amber, Olive Nut, Buddha Beads, Ivory, Nut, Plastic, Wood, etc.