Well-known American knife designer Rick Hinderer teamed with ZT Knives to produce the ZT Zero Tolerance 0561 Hinderer Collaboration Folder — hence the "Hinderer Collaboration" of the product name.This knife is a marriage of great functional design; the highest quality materials, fit and finish; and the most exacting high standards of manufacture. It is a tool which expresses the finest American traditions of innovative design, and micron-level precision tool manufacturing. Not a rivet in sight: the titanium and G10 scales, and repositionable spring-steel clip, are all fixed with hex-drive screws. The blade pivots on ball-bearings — with no side-play. There is not one iota of superfluous decoration on this knife, yet it is an object of great beauty which exudes from the natural qualities of its component materials and uncompromising design and manufacture. The knife doesn't just look good: its high quality has tactile and audio feedback. Smooth one-handed opening with a firm press of the index finger on the blade flipper ends with a distinctive click of the liner lock; the texture and profile of the handle fit and feel right even in my large hand. The curved profile scales, although of totally different materials on each side (titanium and G10) both have a matching fish-scale or scalloped pattern which is attractive as well as an aid to grip.I have carried folding pocket knives as a general purpose tool since childhood in the Australian bush, and have owned a few other very well-made American folders with which to compare this knife. (An ornately engraved Buck Classic II and a remarkable Blackie Collins-designed BenchMark Rolox were favorite former possessions — both stolen!). For its practicality as a pocket tool-kit, my every-day carry knife for many years has been a Victorinox Swiss Army Knife Picnicker. I have always referred to this as my "journalists' model Swiss Army knife" because it has a corkscrew, a combined bottle-opener/screwdriver/staple remover, can opener/small screwdriver, and an awl/reamer useful for document filing, as well as a lock blade equally good for peeling fruit or taking newspaper cuttings, spring-steel tweezers, and a plastic toothpick. I once even used its screwdrivers to replace the headlining of a light aircraft that came loose jouncing around on a flight in a tropical thunderstorm. But it is merely a functional tool, in no way "a thing of beauty".Among single blade folding knives with no add-ons, I have never seen any finer expression of perfection than the ZT Zero Tolerance 0561 Hinderer Collaboration. It is both carriable and collectible. As befits such a well-made item, this is one of the few folding knives inscribed on the blade with individual sequential serial numbers.Right out of the box, this knife is razor-sharp with a beautifully honed double bevelled edge: it slices straight down a sheet of paper held in the hand. The edge on the Swedish powdered steel blade is so good that I will not risk ruining it ever by touching it with any sharpening device except one that has a jig to hold the exact angle, such as the Lansky or Tormek systems (both of which I'm fortunate to own). The manufacturer offers what is probably the best resharpening option of all: free lifetime sharpening at ZT Knives Tualitin, Oregon, facility. This free lifetime sharpening deal is set out in the owner leaflet: "you pay to ship it to us; we pay to ship it back to you". That is a pretty impressive statement of the manufacturer's pride and confidence in this knife.Safety is integral: thumb-operated for closing as recommended in the user leaflet, the liner lock cannot be released in such a way that the blade can close on fingers, because the projecting flipper acts as a stop until the thumb is moved out of the way.The photo gallery already here accurately shows the functions and quality of this very superior large folding knife. I have added some photos showing the ZT Zero Tolerance 0561 Hinderer Collaboration knife compared to three other high quality folding knives that I own: a smaller flipper design, the Spyderco Southard Folder G-10 Plain Edge Knife, and two multi-tool knives in the Victorinox Swiss Army range, the Swiss Army standard issue New Soldier's Knife model 56945, and the civilianized Picnicker, which has been my favorite everyday carry knife for 20 years. These photos show clearly that the ZT Hinderer is considerably larger, more ruggedly built, and more finely finished than many other common folding knives. I rate it even better in fit, finish and function than the also excellent Spyderco Southard Folder.