Material: Aluminum alloy Color: black Length: 90mm Chuck clamping range: 0.3-3.2mm High precision, can clamp 0.3 -3.2mm drill bit. Twist drill bits Material: High speed steel 10pcs Torsion drill bit set (0.5/0.6/0.7/0.8/0.9/ 1.0/1.2/1.5/1.8/2.0mm) Features: For aluminum hobby hand drill. Mini wood drill chuck for jewelry tool micro twist bit. Precise, accurate and efficient. Suitable for wood, plastic, rubber, model and other materials is a borehole. They don't fit steel, iron, stone, hard things like that. Ideal for drilling wood, Jin Gang, linden, horn, amber, olives, walnut, plastic and other materials. Package Included: Quantity: 1 Set Note: Please allow manual measurement errors. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!