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 ordinary center drill bits in sizes 10, 15, 20, 25, 30, 40, and 50 to meet different needs High quality: center drill is made of high-quality high-speed steel, which is strong and resistant to high temperature and wear Widely applicable: compatible with lathes and most electric drills for drilling 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 Only the above package content is included; other products are not included Note: Light and display differences may cause slight color variation between the item and the image. Measurement may vary by +/- 1-3 cm