These industrial-grade twist-drill bits are cut from super-hard, resilient black oxide for the ultimate in durability and strength. Each bit features a 135-degree split point for enhanced hole-drilling performance, including quick starts and clean, burr-free holes. For use in wood, metal, plastics and fiberglass.DEWALT 21-pack black oxide twist drill bit set is ideal for general-purpose drilling materials like metal, hardwood, softwood, PVC and fiberglass Parabolic flute design increases chip ejection in metal and wood drilling applications Black oxide coating helps resist corrosion and increase durability, so your drill bits last longer 135° Split-point tips drill on contact and prevents walking on the hard surface you’re working on 31° Helix reduces over aggressiveness of true parabolic flute, making it ideal for drilling deep holes

• DEWALT 21-pack black oxide twist drill bit set is ideal for general-purpose drilling materials like metal, hardwood, softwood, PVC and fiberglass
• Parabolic flute design increases chip ejection in metal and wood drilling applications
• Black oxide coating helps resist corrosion and increase durability, so your drill bits last longer
• 135° Split-point tips drill on contact and prevents walking on the hard surface you’re working on
• 31° Helix reduces over aggressiveness of true parabolic flute, making it ideal for drilling deep holes