Bestech Keen II BT2301B – 4.19" S35VN Stonewash + Satin, Marble Carbon Fiber + Titanium, Frame Lock

The Bestech Keen II BT2301B is a large-format premium titanium frame lock folder designed by Koenscraft and available at Going Gear, your authorized Bestech dealer. Built around a 4.19-inch S35VN blade with a dual stonewash-and-satin finish, the BT2301B pairs it with a striking black marble carbon fiber and titanium handle — a combination that delivers serious blade performance alongside collector-quality aesthetics. Ceramic ball bearings provide smooth flipper deployment across the Keen II's full 9.82-inch overall length.

The BT2301B is the largest knife in the Bestech titanium series reviewed here — its 4.19-inch blade and 151-gram weight make it a full-size working folder designed for users who need meaningful cutting capacity in an everyday carry package. The stonewash-plus-satin blade finish is a dual-treatment rarely seen in production knives at this price point: the stonewash provides scratch resistance and corrosion protection across the flat of the blade, while the satin finish on the bevel accentuates the S35VN's refined grind geometry and makes the edge line visually distinct. Koenscraft's design is authoritative and purposeful — every proportion of the Keen II is scaled for confident, capable use.

Key Features

• S35VN Blade with Stonewash + Satin Dual Finish — The Bestech Keen II BT2301B uses S35VN stainless steel from Crucible, a benchmark premium blade steel known for excellent toughness, strong corrosion resistance, and easier sharpening than M390 or Elmax. The dual stonewash-and-satin finish is a production rarity: stonewash protects the blade flats while the satin bevel highlights the S35VN's precise grind geometry and makes sharpening progress easy to read.
• Marble Carbon Fiber Handle Inlay — The BT2301B's most visually striking feature is its marble-patterned carbon fiber handle inlay — a swirling black-and-white natural marble pattern embedded in a lightweight, rigid carbon fiber composite. The marble CF inlay is lighter than titanium alone while providing exceptional rigidity and a surface texture that improves grip without aggressive jimping.
• Titanium Frame Lock — The Bestech Keen II BT2301B uses a titanium frame lock for secure, rattle-free lockup across a 4.19-inch blade — a lock type that scales excellently with larger knife formats. The frame lock is integrated cleanly into the black titanium handle without adding visual bulk.
• 4.19-Inch Blade — Serious Cutting Capacity — At 4.19 inches (106.5mm), the Keen II BT2301B is designed for users who need a full-size working blade rather than a compact EDC cutter. The Keen II's blade length handles demanding utility tasks — breaking down boxes, food prep, cord cutting, and field work — that compact knives like the Bestech Icarus BT2302B or Bestech Bruv BT2401C simply can't match at scale.
• Ceramic Ball Bearings — The Bestech Keen II BT2301B deploys via a flipper tab on ceramic ball bearings, providing smooth one-handed opening with superior corrosion resistance over steel bearings — important in a large-blade folder that will see regular use in varied conditions.
• Koenscraft Design — The Keen II is a Bestech collaboration with Koenscraft, a custom knife designer known for authoritative large-format designs that prioritize ergonomics, blade geometry, and proportional balance. The BT2301B reflects Koenscraft's approach: a knife scaled for real work, finished with collector-quality materials.
• Black Titanium Handle with Marble CF Scales — The BT2301B's handle architecture combines a black stonewash titanium frame with marble carbon fiber inlay scales, creating a knife that is simultaneously visually distinctive and practically grounded. The 151-gram weight is appropriate for a 4.19-inch production folder of this build quality.

Who Is the Bestech Keen II BT2301B For?

The Bestech Keen II BT2301B serves three distinct buyers. Heavy EDC users who want a full-size 4-inch-plus folder in premium S35VN titanium will find the Keen II one of the most capable options in Bestech's production lineup — it's built to work, not just to look good. Collectors drawn to marble carbon fiber aesthetics will appreciate Koenscraft's design and the dual-finish blade treatment, which together make the BT2301B stand out even in a high-quality collection. And buyers choosing between S35VN and M390 will find the Keen II a compelling case for S35VN: easier to sharpen in the field, tough enough for hard use, and still delivering the corrosion resistance and edge retention expected of a premium production steel. Available at Going Gear, an authorized Bestech dealer.

Specifications

Frequently Asked Questions

What steel does the Bestech Keen II BT2301B use?

The Bestech Keen II BT2301B uses S35VN stainless steel from Crucible Industries, heat treated for optimal performance. S35VN is a refined version of S30V that adds niobium carbides for improved toughness and better grindability. Compared to M390 (used on Bestech's BT2303F Blind Fury and BT2304B Cetus), S35VN is slightly easier to sharpen in the field while still delivering excellent edge retention and corrosion resistance — making the BT2301B a strong choice for users who sharpen their own blades regularly.

What is the stonewash and satin dual finish on the BT2301B blade?

The Bestech Keen II BT2301B uses two distinct finishing treatments on the same blade. The stonewash finish is applied to the blade flats — creating a textured, matte surface that hides scratches, reduces glare, and adds corrosion resistance. The satin finish is applied to the bevel — creating a polished, reflective surface that makes the grind geometry visually distinct and makes it easy to see sharpening progress when honing the edge. Together, the stonewash-and-satin finish on the BT2301B is a dual treatment rarely seen in production knives and typically associated with higher-end custom or semi-custom work.

How big is the Bestech Keen II BT2301B?

The Bestech Keen II BT2301B is a large-format folding knife: 4.19-inch (106.5mm) blade, 9.82-inch (249.5mm) overall open length, 5.63-inch (143mm) closed length, and 151 grams. For context, it is significantly larger than Bestech's compact titanium folders — the Bestech Icarus BT2302B (2.65", 66g), the Bestech Blind Fury BT2303F (3.62", 114g), and the Bestech Cetus BT2304B (3.94", 176g) are all smaller. The Keen II BT2301B is purpose-built for users who want a full-size working blade, not a minimalist carry piece.

Is the Bestech Keen II BT2301B worth the price?

Yes — the Bestech Keen II BT2301B offers compelling value for a large-format S35VN titanium frame lock with marble carbon fiber inlays, ceramic bearings, a dual stonewash-and-satin blade finish, and a Koenscraft design pedigree. The combination of genuine performance features with collector-quality aesthetics at this price point is difficult to match in production knife making. For buyers who want a full-size premium folder rather than a compact EDC, the BT2301B is one of the strongest options in Bestech's lineup — available at Going Gear.

Bestech Keen II BT2301B vs Bestech Cetus BT2304B — which should I buy?

Both the Bestech Keen II BT2301B and the Bestech Cetus BT2304B are large premium titanium folders with substantial blades and distinctive handle inlays, but they differ in key ways. The BT2301B (4.19" S35VN, 151g, marble CF, stonewash+satin) is the larger blade in a slightly lighter package, with S35VN steel that's easier to field-sharpen and a dual-finish blade treatment that leans toward visual refinement. The BT2304B (3.94" M390, 176g, canvas micarta, bar lock) is heavier, uses M390 for superior edge retention, and has a more aggressive bar lock mechanism. Choose the BT2301B for larger blade reach and easier sharpening; choose the BT2304B for maximum edge retention and a more industrial build aesthetic.

Bestech Keen II BT2301B vs Bestech Blind Fury BT2303F — which is better for daily carry?

The Bestech Keen II BT2301B and the Bestech Blind Fury BT2303F are both M-series titanium frame locks with marble-patterned inlays, but serve very different carry roles. The BT2301B (4.19", 151g) is a large working knife — substantial enough to handle serious tasks but heavier and bulkier for pocket carry. The BT2303F (3.62", 114g) is a more practical everyday carry size with M390 steel and a more compact footprint. For true daily pocket carry, the BT2303F wins on size and weight. For a desk knife, vehicle knife, or pack knife where size isn't constrained, the BT2301B's larger blade is a meaningful advantage.

Who designed the Bestech Keen II?

The Bestech Keen II BT2301B was designed by Koenscraft, a custom knife designer known for large-format, ergonomically purposeful designs that prioritize blade geometry, handle proportion, and material quality. The Keen II is one of Koenscraft's most recognized production collaborations with Bestech — the 4.19-inch blade, dual-finish treatment, and marble carbon fiber handle reflect Koenscraft's philosophy of building knives scaled for real capability rather than minimal carry compromise.

Where can I buy the Bestech Keen II BT2301B?

The Bestech Keen II BT2301B is available at Going Gear, an authorized Bestech Knives dealer. Going Gear carries a wide selection of Bestech titanium frame lock folders including the Bestech Icarus BT2302B, the Bestech Blind Fury BT2303F, and the Bestech Cetus BT2304B. The BT2301B ships from China inventory with worldwide shipping available.

What is the best large Bestech folding knife?

For buyers specifically seeking a large-blade Bestech folding knife, the Bestech Keen II BT2301B is the top answer in Bestech's current titanium production lineup. Its 4.19-inch S35VN blade is the longest among the models reviewed here, and the dual stonewash-and-satin finish and marble carbon fiber handle make it the most visually distinctive large-format option as well. For collectors and heavy EDC users who won't compromise on blade length, the BT2301B is available at Going Gear.