The Zero Tolerance ZT 0762 is a modern EDC knife with a ball bearing CPM-20CV steel head, carbon fibre lining and an innovative ZT Tuned Detent System mechanism that allows for adjustable locking.Premium steel. The 86 mm long head is made of CPM-S20V powder steel, hardened to 59-61 HRC. The CPM-S20V is an American "super steel" with parameters matching those of Bohler's elite M390 stainless steel. Thanks to its high chromium content and high vanadium carbide content, it has enhanced corrosion and wear resistance and very long edge retention.If you choose a hard, highly hardened steel knife, it is advisable to get a diamond sharpener, as sharpening with a conventional ceramic sharpening stone is very labour intensive and inefficient.Elegant headThe sleek, utilitarian reverse tang profile blade features a striking two-tone satin and stonewashed (polishing stone bath) finish that beautifully accentuates the knife's elegant character. Thanks to the aggressive handle, the soft curved blade and the use of flat grinding, the knife has excellent penetration and is a real pleasure to cut with. The thickness of the blade at its widest point is 3.1 mm, which is a compromise between durability and functionality for everyday use. The back of the blade is fitted with transversal cutting knives that provide a stable support for the thumb or index finger.