Features:1. This twist drill chuck set is made of copper with excellent workmanship.2. Three skull-shaped jaws, can be clamped in the range of 0.3-3.2mm. Easy to use and replace.3. Collets can be equipped with twist drill bit as mini handheld drll for ABS plate, aluminum sheet, cardboard drilling. Ideal for use in conjunction with a hand drill or electric drill.4. Tool Accessories, Replacement and General Equipment for Workshop: Bathroom Fittings and Hardware, Sanitary Kit, Bathroom Shelves, Soap Dishes, Hardware, Locks, Connectors, Electrical Equipment and Supplies, Switches, Kitchen Fixtures, Wallpaper, Lighting and Lighting, Hand Tools, Screwdriver, Wrench, Pliers, Tool Kits, Measuring and Analytical Instruments, Electrical Soldering Materials, Tool Parts. Specification:Material: Brass + Aluminum Alloy Color: Black + Gold Size:Tail Diameter: 2.0/2.35/3.0/3.17/5.0mm Total Length: 33mm Package Contents:1 x Drill Chuck1 x Hex WrenchNote:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.