Hard and wearresistant: The hole drill screw, made of carbon steel, offers hardness and wear resistance, allowing it to handle hard solid wood and composite materials effectively while maintaining sharpness over time. Double spiral groove: The 90degree countersink carbide tip features a wider double helix chip chute, effectively discharging wood chips and debris to prevent clogging and increase cutting efficiency for a smoother drilling process. The double spiral groove design enhances heat dissipation, reducing the drill bit's temperature during use and extending its service life. Easy drilling: The drill bit depth stop collar's blade is designed to easily penetrate various materials like pine, walnut, density board, and plastic, making it versatile and simplifying the drilling process. Its carefully processed cutting edge offers low resistance, enhancing efficiency. Adjustable: The drill bit with a depth stop and accessories has a fixed head length, which is suitable for different material thicknesses and is convenient for use. Use scenarios: Drilling precise dowel or pilot holes in pine or walnut for furniture assembly, with depth control to ensure consistent hole depth. Creating holes in density board or plastic components for hardware installation or mounting applications, benefiting from low resistance cutting. Working with hardwood or composite materials where efficient chip evacuation and cooler operation help maintain tool performance during repeated drilling.