PDTools

Herman Knives strives for perfection in every aspect of its work. The same philosophy guided us in selecting sharpening stones that would ensure not only a perfectly sharp edge but also long-term durability of that sharpness. After extensive testing and comparison, we found the ideal solution — PD Tools sharpening stones, designed with ultimate precision in mind. 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 our knives in perfect condition.

PD Tools stones are industrial-grade tools, originally developed for professional use in manufacturing plants, tool workshops, and precision facilities. Today, they are also available to enthusiasts and professionals who want to achieve the same quality in their own workshop or sharpening setup.

PD Tools (Poltava Diamond Tools) is a European manufacturer of high-purity diamond and CBN (Cubic Boron Nitride) tools. Founded in 1966, the company has spent more than half a century developing advanced abrasive technologies used in precision industries. Its products — including sharpening stones, grinding segments, and discs — are used for processing metals, powdered steels, ceramics, and glass.

Each PD Tools stone is made with diamond or CBN grains of over 99.9% purity, evenly distributed within the bonding structure using Uniform Bond technology. This guarantees consistent performance and long-lasting efficiency throughout the stone’s life. Unlike most commonly available sharpening stones, PD Tools retain their properties incomparably longer — they are an investment for many years.

Exceptional flatness tolerance of up to 0.01 mm ensures a stable sharpening angle and perfectly symmetrical edge. Each stone works smoothly, without vibration, and requires minimal flattening. They can be used dry or with a small amount of mineral oil, such as KAZAK, and are always ready for precise work.

As a result, the edge forms faster, cleaner, and with greater control, while the surface after sharpening gains a refined, almost polished finish. PD Tools are created for those who expect repeatable, precise, and fully controlled sharpening performance.

Moreover, PD Tools are regularly used by well-known knife reviewers and testing channels, who value their consistency, precision, and durability — the very qualities that define the craftsmanship of Herman Knives.