Strength, precision, and unbreakable reliability.
Extrema Ratio ONTOS II S600 Black is a professional fixed blade knife, created for demanding situations where uncompromising performance is essential. It combines robust construction, highly durable materials, and ergonomics that give you confidence in any environment – from tactical tasks to challenging outdoor missions.
The moment you grip the handle, you will feel the solidity and stability that will not let you down. The matte black blade made from premium steel cuts cleanly and decisively, while its surface finish reduces light reflection and resists corrosion. ONTOS II is a tool that knows no compromise – only performance and reliability.
Full Tang construction
Kydex sheath
ONTOS II confirms the brand philosophy: combining technical excellence with maximum reliability.
Extrema Ratio is an Italian brand with a reputation for producing top-tier knives for professionals.
Every knife is made with an emphasis on quality, functionality, and long-term durability.
ONTOS II S600 is designed as a professional fixed blade knife for tactical deployment and demanding outdoor use. It is a tool that can handle hard work – from precise cuts to tasks where strength and toughness are required.
This is not a decorative piece – it is a tool that matters when reliability without excuses is needed.
🛒 Available on our Moskito website.
Extrema Ratio ONTOS II S600 Black is a fixed blade knife for those who refuse to compromise. It is a tool that will stand by you in demanding situations and deliver performance, reliability, and a long service life.
ONTOS II is not just a knife – it is a partner for situations where every stroke matters.
