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LionSteel Jack
The LionSteel Jack is the brand's answer to a question the traditional knife market doesn't ask often enough: what does a classic slip joint look like when you build it with M390 steel, titanium bolsters and liners, and the same manufacturing precision applied to LionSteel's SOLID flippers? The result is a 6.89-inch, swayback-handled traditional folder that carries the aesthetic language of an Italian gentleman's knife while performing well above what the form factor typically delivers.
The blade is a flat ground clip point at 77mm, opened via dual nail nicks on a moderate-tension backspring with snappy half and full stops. The crowned spine and chamfered bolsters eliminate the hot spots common in production traditional knives, and the titanium liner framework keeps the JK1 — the single-blade version — at 1.87 oz. That's genuinely light for a knife with this level of hardware. The Jack carries loose in the pocket or in one of LionSteel's optional leather sheaths; there is no pocket clip on any variant.
Choosing Your Configuration
The Jack series is built around three tool configurations. The JK1 is the clean single-blade version for buyers who want nothing more than a well-made slip joint in their pocket. The JK2 adds a second blade in M390 that functions as a flathead screwdriver and cap lifter — a practical addition that doesn't compromise the knife's profile significantly. The JK3 builds on the JK2 by adding a spiral corkscrew in 420C stainless, making it the most versatile configuration and the logical choice for outdoor or travel use.
All three variants are available in the same handle scale options: black G-10, green canvas micarta, carbon fiber, santos wood, and olive wood. Titanium bolsters and liners are standard across the lineup regardless of which scale material you choose.
LionSteel Warranty
LionSteel backs the Jack against defects in materials and workmanship. Verified manufacturing defects will be repaired or replaced at no cost.
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