The bottle opener is integrated into the spine of the GFN handle — a notched cutout machined directly into the handle body toward the rear end, positioned to hook under a bottle cap and lever it off cleanly. It functions the same way as a standalone opener: hook the notch under the cap edge, apply downward pressure, and the cap pops free. The opener is always accessible whether the blade is open or closed, requiring no separate deployment or adjustment. It is sized to work with standard crown-top bottle caps and is part of the handle structure — it does not move, flex, or degrade with use.

DuraLock is Kershaw's crossbar locking system, and the Craze is one of the most compact knives in the lineup to run this hardware. A hardened steel crossbar passes laterally through the GFN handle and drops into a notch in the blade tang when the blade reaches full open, locking it positively in place across a wide contact area. To close, push the crossbar from either side with your thumb — it clears the tang notch and the blade folds freely. At a 2.35-inch blade length and a 3.25-inch closed handle, the DuraLock on the Craze provides significantly more lock stability than a standard Liner Lock would at this compact size — an unusual level of lock quality for a knife in this price and size category.

8Cr13MoV is a Chinese stainless alloy widely used in production folders at the entry and value tier. It offers good corrosion resistance for a pocket knife — it handles moisture from daily carry without the surface rust concern of semi-stainless steels like D2 — and is notably easy to sharpen, responding quickly to a ceramic rod or bench stone to come back to a working edge. The trade-off compared to higher-tier steels like D2 or CPM MagnaCut is edge retention: 8Cr13MoV dulls faster under sustained cutting use and requires more frequent touch-ups. For a compact utility carry tool used for light everyday tasks — opening packages, cutting tape, food prep, general cutting — 8Cr13MoV is fully adequate and its easy resharpening is often a practical advantage over harder-to-maintain premium steels.

Blackwash is produced by applying a stonewash texture to the blade first, then a black coating over the top. The black settles into the recesses of the stonewash texture and wears away at the high points, creating a two-tone effect that reads as all-black at a glance but shows surface depth and grind geometry detail up close. For a compact utility carry knife like the Craze, blackwash does two practical things: it hides the minor surface marks and pocket lint scratches that accumulate with daily use, and it adds a corrosion barrier layer across the blade face that the underlying 8Cr13MoV benefits from in humid or high-moisture carry conditions.

The Craze (8337) and the D2 DuraLock GFN models (Monitor 2041, Covalent 2042, Layup 2047) all share the DuraLock crossbar lock and black GFN handle as a common platform foundation. The differences are blade length, steel, and additional features. The Craze runs 8Cr13MoV at 2.35 inches with an integrated bottle opener — it is the most compact and most feature-diverse model in the DuraLock GFN family, optimized for lightweight utility carry and everyday versatility. The D2 models run 3.0 to 3.4 inches in D2 tool steel without a bottle opener, optimized for working-knife edge retention in a larger format. The Craze is the right call for buyers who want compact size, easy maintenance steel, and the bottle opener. The D2 models are the right call for buyers who prioritize blade length and steel performance.

The Craze 8337 is a manual folding knife with thumb stud deployment — not assisted-opening, automatic, or OTF — which places it in the broadest legal carry category under most state laws. A 2.35-inch blade clears the carry limit in virtually all US jurisdictions, including the strictest municipal blade length restrictions. Knifeworks cannot provide legal advice. Check your local laws at akti.org (American Knife and Tool Institute) before carrying, or call us at 888-225-9775.

Kershaw offers a lifetime warranty against defects in materials and workmanship. If the knife fails due to a manufacturing defect, Kershaw will repair or replace it at no charge. Warranty service is handled directly by Kershaw — not Knifeworks. Submit a claim through Kershaw's website at kershawknives.com with a description of the issue and proof of purchase. Normal wear, cosmetic finish wear, sharpening, and damage from misuse are not covered.

The Kershaw Craze 8337 is manufactured in China under Kershaw's offshore production program. Kershaw designs, engineers, and quality-controls all models from their Tualatin, Oregon headquarters, and the Craze carries the same Kershaw Lifetime Warranty as their USA-made production pieces. Buyers who prefer domestic manufacturing and premium steel should consider the Bel Air series (6105) in CPM MagnaCut, which is USA made in Tualatin, Oregon.