Professional and exquisite workmanship ensures sturdy and durable construction. Sharp and long-lasting cutting edges provide efficient and reliable performance. Wear-resistant and rust-resistant properties enhance practicality and longevity. Suitable for a wide range of materials including stainless steel, iron, aluminum alloy, plastic, and wood. Compatible with hand drills, bench drills, and other power tools. Made from high-speed steel for increased durability. Available in eight sizes: 3.0mm, 3.2mm, 3.5mm, 4.0mm, 4.2mm, 4.5mm, 5.0mm, and 5.2mm. Size Details: 3.0mm: Length: 4.4cm (1.73"), Working Length: 1.1cm (0.43") 3.2mm: Length: 4.4cm (1.73"), Working Length: 1.1cm (0.43") 3.5mm: Length: 4.8cm (1.89"), Working Length: 1.4cm (0.55") 4.0mm: Length: 5.3cm (2.09"), Working Length: 1.6cm (0.63") 4.2mm: Length: 5.5cm (2.17"), Working Length: 1.7cm (0.67") 4.5mm: Length: 5.8cm (2.28"), Working Length: 1.8cm (0.71") 5.0mm: Length: 6.2cm (2.44"), Working Length: 2.0cm (0.79") 5.2mm: Length: 6.4cm (2.52"), Working Length: 2.4cm (0.94") Item Name: Double-ended Twist Drill Bit Material: High Speed Steel Features: Wear-resistant, Precision Drilling, Multiple Sizes Note: Due to lighting and screen settings, the actual color may vary slightly from images. Slight measurement variations may occur due to manual measurement. Package Includes: 10 x Drill Bits