This is achieved through the RUKO conical countersink, thanks to its unique cutting geometry, specially developed variable clearance processing, transition radii, and an extra-wide flute. It delivers the best performance in nearly all materials and applications while requiring significantly less feed force. The tool offers up to 60% longer tool life and up to 30% faster sink rates, ensuring an extremely smooth operation and an optimal sinking pattern with ideal chip removal. HSS: High-performance high-speed steel for drilling in well-machinable materials with a strength of up to 900 N/mm².