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The Extrema Ratio Estrema Axe blends millennia of heritage with modern innovation. From its ancient origins as a dependable work tool—dating back to 6000 BC—to its enduring reputation for strength and versatility, the axe has always been a symbol of practical power. Developed for the G.O.I. (Operational Raiders Group) of the Italian Navy, the Estrema reimagines this tradition for today’s most demanding professional and outdoor applications, serving as both a high-performance utility and breaching tool. Made from Böhler N690 steel (54 HRC) with a Dark Stone finish, it features a G10 handle with multiple grip options, plus a reinforced shank, metal cutter, lever, or crowbar.
For added versatility, the Estrema can be fitted with a heat-treated carbon steel hammer (optional extra) — a first-of-its-kind quick-attach system with a secure safety lock. Supplied in an airtight technical case, it includes an ambidextrous Kydex sheath and belt clip, with multiple carry options including MOLLE compatibility. Robust, adaptable, and precision-engineered, the Estrema is Extrema Ratio’s most daring production to date— ready to excel in any challenging environment.
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Yes, this item is legal to own in the United Kingdom.
We base this opinion on our interpretation of UK Knife Law (see our blog). Be aware that there are different rules for owning and carrying knives in public in the UK. Read about the difference here.
Yes, this item is legal to own in the United Kingdom.
We base this opinion on our interpretation of UK Knife Law (see our blog). Be aware that there are different rules for owning and carrying knives in public in the UK. Read about the difference here.