Accuracy: 60-degree angle center drill is suitable for drilling accurate center holes, 60-degree countersink holes, or starting holes, and is ideal for use with larger drills in metal processing. Multiple sizes: Includes 7 standard center drill bits: 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, and 5.0 mm to meet various application needs. High quality: Center drill bits are made of high-quality high-speed steel, offering strength, high-temperature resistance, and wear resistance. Widely applicable: Compatible with lathes and most electric drills for use on hard materials such as steel, iron, aluminum, carbon steel, and brass with hardness ranging from 170HB to 200HB. Material: High-speed steel Color: Silver Package Contents: 7 x Center Drill Bits Set Note: Light shooting and different displays may cause slight variations in the color of the item in the picture compared to the actual product. Measurement may vary by +/- 1-3 cm.