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.
PDTools PREMIUM BRONZE Sharpening Stone – 80 Grit
The PDTools PREMIUM BRONZE series is built for fast, aggressive stock removal and long-lasting performance. Using a durable metal-bond (bronze) structure, these stones deliver outstanding cutting efficiency and shape stability even under heavy use.
The 80 GRIT model is designed for initial edge formation, geometry correction, and repairing damaged blades. It works efficiently with high-hardness steels up to 70 HRC, ensuring fast and controlled material removal.
Abrasive: CBN (Cubic Boron Nitride)
Bond: Bronze metal bond
Grit: 80
Working layer thickness: 3 mm
Stone dimensions: 150 × 25 × 3 mm
Overall size (with blank): 160 × 25 × 6 mm
Compatibility: TSPROF, KME, Edge Pro, Kazak, Hapstone, Blitz, and similar guided systems
Use: dry or with minimal lubrication
Trusted by Herman Knives during rough sharpening stages, the PDTools PREMIUM BRONZE stones combine endurance with precision — a professional choice for shaping and restoring even the hardest modern steels.
PDTools is a European manufacturer of professional abrasive tools, specializing in high-purity diamond and CBN sharpening stones. Founded in 1966 in Poltava, Ukraine, the company has spent more than half a century developing technologies for precision industries — from metal and powdered steel processing to ceramics and glass.
All PDTools stones are made using abrasive grains of over 99.9% purity, evenly distributed within the bond structure through Uniform Bond technology. This ensures consistent performance, long-term stability, and precise, repeatable results. The manufacturer maintains a flatness tolerance of 0.01 mm, guaranteeing an accurate sharpening angle and perfectly symmetrical edge.
As part of PDT GROUP, PDTools supplies its products to more than 70 countries worldwide and operates under a certified ISO 9001:2015 quality system. Trusted by Herman Knives, PDTools stones combine industrial-grade precision with the craftsmanship demanded by the finest knife makers.
