It is a Aluminium Alloy Pin Vise Hand Drill/DIY Tool/Hand Twisting Drill. Chuck Diameter: 0.4”/ 1CM. Material: Aliminium Alloy Hand Drill & High Speed Steel Twist Bits. Application: Mainly used for Wood, Resin, Jewelry, Walnut, Amber, Beeswax, Olive Nut, Vajra Bodhi, Beads, Ivory Nut, PVC, Acrylic and Plastic etc.