Heavy Duty High Speed Steel Aircraft Extension Drill Bit Five Sixteenth Inch By Six Inch Black Oxide Coated For Lubricity And Coolant Pockets Near The Cutting Edge Built To Last For General Metal Drilling Pack Of 12 DWDA C Series

Heavy-Duty 5/16 in HSS Drill Bit, 6 in, Pack of 12
✔️ 5/16 in high-speed steel, 6 in length, black oxide coating, 12-pack

This high-speed steel drill bit is designed for general metal drilling, especially in mild steels, with extended reach of 6 inches. It features a black oxide finish to improve lubricity and coolant pockets near the cutting edge help with chip flow. Manufactured to National Aerospace Standard 907 for consistent performance.

✅ 5/16 in diameter, 6 in length
✅ High-Speed Steel (HSS) drill bit with DWDA/C Series design
✅ Black oxide coating improves lubricity and chip flow near the cutting edge
✅ 135 split point reduces walking and centers starts for clean holes
✅ Pack of 12 for bulk workshop use

💡 What is a 135 split point high-speed steel drill bit best used for in metalworking?

In metalworking, this bit is handy for clean starts and long life when drilling mild steels and similar alloys.
- self-centering 135 split point reduces walking and ensures accurate holes
- black oxide coating boosts lubricity and chip flow near the cutting edge
- high-speed steel construction delivers wear resistance for long tool life
- 6 inch length provides extended reach for deep drilling✝️