1Pcs chip flute design AType 4mm HSS Centre Drill Set Center Drill Countersink Lathe Bit

Feature:

• Suitable for bench drills, milling machines, machining centers.
• High‑speed steel material, with high hardness, of sharpness, wear‑resistant and heat‑resistant, long service life.
• Enlarged chip flute design, beneficial to high‑speed operation and accelerate chip removal.
• Better strength and durability all‑ground spiral positioning with high work efficiency.
• Special for die steel and stainless steel processing, very practical.