Herman Knives strives for perfection in every aspect of its work. The same philosophy guided us when selecting sharpening stones that would ensure not only a perfectly sharp edge but also the long-term preservation of that sharpness. After extensive testing and comparison, we found the ideal solution — PD Tools sharpening stones, created for the highest level of precision. These are the exact models we use at Herman Knives, and the grit options available at Polish Custom Knives are those we recommend for maintaining and caring for our knives in perfect condition.
PD Tools stones are industrial-grade tools originally designed for professional, commercial use — in manufacturing plants, tool workshops, and precision craft facilities. Today, they are available to specialists and enthusiasts who want to achieve the same professional results in their own workshops or home sharpening setups.
PD Tools (Poltava Diamond Tools) is a European manufacturer of high-purity diamond and CBN (Cubic Boron Nitride) abrasives. Founded in 1966, the company has spent decades developing advanced abrasive technologies used in precision industries. Their product range includes sharpening stones, grinding tools, segments, and discs for working with metals, powdered steels, ceramics, glass, and other demanding materials.
Each PD Tools stone utilizes diamond or CBN grains with a purity level exceeding 99.9%, uniformly distributed within the bonding structure using Uniform Bond technology. This ensures consistent performance, long-term stability, and efficient cutting action throughout the stone’s lifespan. PD Tools stones maintain their flatness and cutting efficiency even after prolonged use.
Exceptional flatness tolerance of up to 0.01 mm guarantees a stable sharpening angle and perfectly symmetrical edge geometry. Every stone works smoothly, without vibrations or the need for frequent flattening. They can be used dry or with a small amount of mineral oil (e.g., KAZAK), always ready for precise work.
The result is faster, more controlled edge formation with a polished-like finish. PD Tools are designed for those who expect repeatable, precise, and fully controlled results — the same standard trusted in the workshop of Herman Knives.
The PDTools EXPERT PRO series represents the pinnacle of precision finishing technology, designed for professionals and enthusiasts who demand the ultimate in sharpness and polish quality. Built using high-purity CBN (Cubic Boron Nitride) abrasive and an advanced ceramic–resin bond, these stones deliver exceptional smoothness, control, and consistency during ultra-fine edge refinement.
The 5000 GRIT stone is intended for final polishing and mirror finishing. It perfects the edge geometry, removes microscopic burrs, and leaves the blade with a flawless, reflective surface and a razor-sharp cutting line. Ideal for the final stage of sharpening premium knives, surgical tools, and precision instruments.
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Abrasive: CBN (Cubic Boron Nitride)
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Bond: Advanced ceramic–resin
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Grit: 5000
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Working layer thickness: 3 mm
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Stone dimensions: 150 × 25 × 3 mm
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Overall size (with blank): 160 × 25 × 6 mm
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Compatibility: TSPROF, KME, Edge Pro, Kazak, Hapstone, Blitz, and other guided systems
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Use: Dry or with minimal lubrication
Used by Herman Knives for the final mirror-polish stage, the PDTools EXPERT PRO 5000 GRIT stone achieves unmatched sharpness, symmetry, and visual perfection — the professional finishing touch for those who treat sharpening as both science and art.