31.0MM CSK ULTIMATECUT 4S RUNATEC HSSE 90 DEG RUKO COUNTERSINK

Does it better. Does it faster. Does it longer.

Engineered from HSSE-Co5 and enhanced with RUnaTEC coating, the new ULTIMATECUT 4S delivers up to 3× longer tool life and 50% faster results—even in tough materials like heat-treated steel.

With four cutting edges and unequal division, it runs smoother, reduces feed force, and eliminates chatter marks for a flawless finish. Works effortlessly in CNC, pillar drills, and now even hand-held tools up to Ø40 mm.

✔ Best-in-class performance for manual + stationary use.
✔ Ultra-smooth countersinking with minimal force.
✔ No welding, no chatter—just clean, precise results.
✔ 3-surface shank for secure grip and power transfer.
✔ Extreme wear resistance and nano-hardness.