Geometric Precision: The 4-Piece Swallowtail Knives Set

In professional chip carving, the cleanest results are achieved not through strength, but through the mechanical separation of fibers with minimal resistance. This 4-piece STRYI-AY Swallowtail SET is the foundation of the "Adolf Yurev" technique—a specialized system that allows for the execution of complex geometric patterns in just three precise cuts. Featuring a unique "triangle" blade geometry and a low-profile 2mm thickness, these knives are engineered to dive into the timber without the "bruising" or crushing common with thicker industrial blades.

Workshop Logic: The Volumetric Workflow

This set is curated as a "Scaling System" for geometric art. In a professional chip carving workflow, your accuracy depends on the relationship between your hand and the cutting apex. These knives utilize a short-blade design to bring your center of gravity closer to the wood, providing the 1:1 tactile feedback required for sharp-walled incisions. While the 25mm and 30mm knives handle high-density detailing, the 35mm and massive 70mm blades provide the reach and leverage needed for long architectural lines and large-scale volumetric patterns. This set serves as the primary engine for establish geometry before refining with gouges and V-tools.

The “Pro-Steel” Advantage

• Hand-Forged W1-7 Carbon Steel: Forged to maintain a refined molecular structure, supporting a razor edge that slices through cross-grain with zero "skating."

• 60–62 HRC Hardness: Subjected to an 11-stage tempering cycle, ensuring professional edge retention through long sessions in seasoned hardwoods or buttery basswood.

• 2mm Precision Profile: Specifically chosen for chip carving to eliminate the "wedge effect." This thin geometry allows the blade to dive deep into the wood with 40% less physical force than standard knives.

• Premium Walnut Handles: Finished with natural linseed oil, these handles provide a dense, high-friction grip essential for the high-pressure stop-cuts required in volumetric work.

• Adolf Yurev (AY) Signature Geometry: These "Swallowtail" blades are optimized for the specific entry and exit angles needed to clear chips in the Yurev three-cut method.

• Manufacturer-Direct Quality: Produced in our Ukrainian forge, ensuring direct accountability for the metallurgy and geometry of every knife.

What’s in the Kit

• Swallowtail Knife 25mm (Art. 390025): The micro-detailing specialist. Optimized for cleaning the deep apex of small chips and executing high-resolution geometric patterns.

• Swallowtail Knife 30mm (Art. 390030): The workshop workhorse. Perfectly balanced for standard chip sizes and establishing the foundational silhouettes of your ornament.

• Swallowtail Knife 35mm (Art. 390035): The waste-clearance engine. Its extended edge provides the stability needed for larger geometric units and deeper volumetric incisions.

• Swallowtail Knife 70mm (Art. 390070): The architectural architect. A rare, high-leverage blade designed for long, straight structural lines and massive relief ornaments where smaller knives lose tracking.

Complete Your Workshop

• STRYI Basswood Practice Board (Chip Patterns): The most efficient way to master the Adolf Yurev volumetric technique. This board features pre-marked geometric patterns on premium, knot-free lime wood.

• STRYI Profiled Leather Strop : Professional-grade maintenance for the specialized geometries in this kit. The flat leather sections are engineered for honing the swallowtail knives, while the contoured grooves perfectly match the radii of your U-gouge and V-tool. 

• STRYI 4-Piece Beginner Woodworking Knife SET: The ultimate expansion for broader workshop versatility. While your chip carving set handles geometry, this kit provides the essential whittling and detail knives needed for external silhouette shaping and deep marking cuts.