Accuracy: 60-degree angle center drill is suitable for drilling accurate center holes, 60-degree countersink holes, or starting holes, and is suitable for larger drills in metal processing. Multiple sizes: Includes 7 standard center drill bits: 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm to meet various needs. High quality: Center drill bits are made of high-quality high-speed steel, offering strength, heat 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 the color of the item in the picture to vary slightly from the real thing. Measurement may have an error of +/- 1-3cm.