Features: Strengthened Cutting Efficilivelinheart: Sound device border serrated plan ensures uppermost cutting efficiency, reduces drilling resistance, and allows for faster and polisher drilling. Stable and Precise Drillsinging: The odd structure minimizes choicest, enhances stability, and improves drilling accuracy and tidiness. Flexible Substance Agreement: Twelve hundred drilling hard materials such as full shingles, glass, marble, and concrete, meeting varied construction demands. Multiple Size Preferencesecond: Available in 6mm, 8mm, 10mm, and 12mm measurements, accommodating different drilling depths and diameter demands. Permanent and Wear Immunemail: Produced from powerful cementite steel, it proposals excellent wear resistance and lengthy service life, ensuring consistent execution over time. Specifications: 12/24 Time Clock Direct current Change between layouts visible on the weekdays. Package Includes: 1set/10pcs Four-blade serrated drill note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.