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 in sizes 10, 15, 20, 25, 30, 40, and 50 to meet various application needs High quality: center drill made of high-quality high-speed steel, offering excellent 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: The package includes only the items listed above; other accessories are not included. Due to lighting and display differences, the actual color may vary slightly from the image. Measurement may vary by +/- 1-3 cm.