General description The 28 Pcs Center Drill Bits Set is designed for precision drilling, featuring a 60-degree angle that is ideal for creating accurate center holes, countersunk holes, or starting holes. This versatile kit is suitable for use with larger drills in metal processing. Technical specifications Includes 28 pieces of center drills Sizes: 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 mm Material: High-quality steel Color: Silver Hardness range: 170HB to 200HB Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with lathes and most electronic drills Usage Suitable for drilling hard materials such as steel, iron, aluminum, carbon steel, and brass Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.