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: including 7 ordinary center drill bits, 10, 15, 20, 25, 30, 40, 50 to meet different needs High quality: Our center drill is made of high-quality high-speed steel, which is strong and resistant to high temperature and wear Widely applicable: together with lathes and most electronic drills to drill hard materials such as steel, iron, aluminum, carbon steel, brass, etc., ranging from 170HB to 200HB Material:High speed steel colour:Silver Package Contents: 7 x Center Drill Bits Set Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.