Specifications: Made from premium quality copper and high-speed steel materials, these drill bits are durable and practical for everyday use. This set is designed to access tight spaces with ease, making it a useful addition to your toolkit. Suitable for manual drilling in wood, bone, horns, amber, olive pits, walnuts, plastics, and other similar materials.Item Name: Drill Bits Set Material: Copper, High-Speed Steel Clamping Range: 0.3 cm - 3.4 cm Twist Drill Bits Specifications (10 Pcs): 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm Twist Drill Bits Specifications (20 Pcs): 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm Features: Drilling tools, durable, portable, multifunctional Copper Bit Holder Length: 10 cm (approximately 3.94 inches) Note: Due to differences in lighting and screen settings, the item color may vary slightly from the images. Slight dimensional variations may occur due to manual measurement. Package Includes: 1 x Copper Bit Holder 10 x Twist Drill Bits or 1 x Copper Bit Holder 20 x Twist Drill Bits