It is a Aluminum Alloy Hand Drill/Spiral Hand Push Drill/DIY Tools/Hand Tools. Chuck Diameter: 0.3”/ 0.8cm, Material: Aliminium Alloy Hand Drill & High Speed Steel Twist Bits. Aliminium Alloy & High Speed Steel Bit. Application: Mainly used for Model, Resin, Jewelry, Walnut, Amber, Olive Nut, Buddha Beads, Ivory, Nut, Plastic, Wood, etc.