Professional Grade 5 Piece Counterbore Drill Bits Set With 4 Flutes Straight End Mills HSS Countersink Slot End Mills For Copper Aluminum Cast Iron M3 To M8 Ideal For Quick Tool Changes And Long Lasting Performance For DIYers

5pc HSS Counterbore Drill Bit Set for fast tool changes
✔️ M3 to M8 sizes, HSS-AL steel, 5pc set, high accuracy

These five high-speed steel counterbore and slot end mills are designed for milling machines to finish bolt heads or screw recesses. Ideal for copper, aluminum, steel, and cast iron, they deliver precise openings and quick tool changes for efficient DIY and professional work.

✅ Material: HSS-AL super-hard high-speed steel
✅ Hardness: HRC65-68
✅ Sizes: M3 3.2 x 5.9 x 6 x 45mm; M4 4.2 x 7.4 x 6 x 48mm; M5 5.2 x 8.9 x 6 x 51mm; M6 6.2 x 10.4 x 8 x 58mm; M8 8.2 x 13.4 x 12 x 67mm
✅ Includes 1 Set (5pcs) Countersink Mill Cutters
✅ Weight: approx 128g

💡 What is a countersink drill bit set used for?

These handy bits are designed to create flush countersinks for bolt heads and screw recesses in metal parts, making joints neat and strong.

- Handy for bolt-head seating on copper, aluminum, steel, and cast iron on milling machines - Creates clean, flush countersink holes for fast assembly - The 4-flute straight end mills optimize chip removal and reduce vibration - High-speed steel (HSS-AL) offers long life and corrosion resistance