Four-point-one inches of blade in a 3.58-ounce knife is a strange and interesting set of numbers. CIVIVI's Estoc is the biggest folding knife in the company's sub-$100 range, and it gets there without the usual half-pound penalty.
Full specs: 9.13 inches overall, 4.1-inch drop point in Nitro-X7 at 0.13 inch stock and 61-63 HRC, hollow grind, satin finish, 5.03-inch closed length, 3.58 ounces, liner lock, caged ceramic bearings, reversible tip-up clip. The handle is a G10 and fiberglass fabric laminate in black and silver at 0.6 inch thick, and the whole thing was designed in-house.
Nitro-X7 is the notable part. CIVIVI has been moving from 14C28N to nitrogen-alloyed steels with higher hardness ceilings, and 61-63 HRC is a serious number for a $99 knife. High hardness on a hollow-ground 4.1-inch blade gives you a slicer that resists edge rolling, at the cost of chip resistance if you hit something hard. At this length, the hollow grind is the right call: it thins the geometry near the edge so a long blade does not wedge in cardboard.
Compared with CIVIVI's own Flydown fixed blade at $71.70, the Estoc costs $28 more and gives up fixed-blade certainty for a folding package. Compared with the $174 Elite Penumbra, you get a bigger blade, a less exotic steel, and no titanium. The Estoc's real competition is the fixed blade you would otherwise carry: at 9.13 inches open and 3.58 ounces, it carries like a four-inch knife and folds like a three-inch one.
Verdict: the value pick if you want a genuinely large folder without paying titanium money. Nitro-X7 at 61-63 HRC is the reason to buy it, and the liner lock is the compromise to accept at $99.70. Know your local blade-length law before you order. Note also that these listings are sample SKUs, so the colorways attached to a sample number are not guaranteed to be the retail assortment.
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