Kondo Ishiku Dōgu Seisakusho Tonkachi Stone Hammer / Masonry Hammer — 19-Square Face & 20mm Blade Width, Double Carbide Tips, Oak Handle, Total Length 300mm

OVERVIEW & PRODUCT DESCRIPTION
Achieve precise natural stone shaping, professional masonry detailing, and efficient stone surface adjustment with exceptional durability and traditional craftsmanship using the Kondo Ishiku Dōgu Seisakusho Tonkachi Stone Hammer (Model #1234).

Crafted by specialist stonemasonry tool artisans at Kondo Ishiku Dōgu Seisakusho, this specialized precision tonkachi features high-grade tungsten carbide tips expertly brazed onto both the 19-square striking face and the 20mm blade-width face. Mounted on a sturdy, shock-absorbing Japanese oak wood handle (樫柄 - 300mm total length, balanced 270g head weight), it delivers steady control, reliable impact transmission, and comfortable handling for stone dressing and sculptural work.

Whether used for professional landscaping, Japanese garden construction (Nihon Teien), architectural stone masonry, or general flagstone detailing, this authentic Japanese tool delivers uncompromising performance and enduring reliability.

KEY FEATURES & SPECIFICATIONS
- Double-Sided Tungsten Carbide Tips (両超硬付): Features high-grade tungsten carbide cutting faces on both the 19-square face and the 20mm blade face to maximize wear resistance and tool longevity against hard stone.
- Ergonomic Japanese Oak Wood Handle (樫柄付き): Fitted with a durable, resilient natural oak handle, providing excellent shock absorption and a secure grip during repetitive striking.
- Balanced 270g Head & 300mm Reach: Engineered with an overall length of 300mm, a 19-square face, a 20mm blade width, and a balanced 270g head weight (全長300ｍｍ・角19ｍｍ×刃幅20ｍｍ・重量270g) to ensure optimal precision, reduced fatigue, and pinpoint strike accuracy.
- Professional Stonemasonry Utility: Ideal for stone carving, general stone dressing, surface detailing, masonry joints, and traditional Japanese garden stone construction.
- Handcrafted in Japan: Built with the uncompromising quality expected of traditional Japanese tool makers.

- Specifications:
  - Brand: Kondo Ishiku Dōgu Seisakusho (近藤石工道具製作所)
  - Model: #1234 (トンカチ 19角×刃幅20ｍｍ 両超硬付 樫柄付き)
  - Total Length: 300mm (全長 300ｍｍ)
  - Striking Faces: 19-Square Face & 20mm Blade Width Face (角19ｍｍ×刃幅20ｍｍ)
  - Head Weight: 270g (重量 270g)
  - Handle Material: Japanese Oak Wood (樫柄)
  - Edge Type: Double-sided carbide-tipped masonry hammer (両超硬付 トンカチ)
  - Origin: Made in Japan

IMPORTANT USAGE & CARE GUIDE FOR CARBIDE TOOLS
- Full-Square & Full-Blade Strike Alignment: Always ensure the entire striking surface (square face or blade face) makes flat contact with the stone. Striking at an angle (hitting on points or corners only) will cause the delicate carbide tips to chip.
- Break-In Period: Exercise extreme caution when using a brand-new tool. Gradually break in the sharp edges by slowly rounding them off and allowing the tool to adapt to your workflow during initial use.
- Delicate Nature of Carbide: Carbide products are extremely hard yet brittle and sensitive to impact shock. Please handle with care.
- Note on Chipping: Due to the nature of carbide tools, improper striking angles may cause minor chipping along the edges or corners. This is a normal characteristic of high-hardness striking tools and is not considered a product defect. Chipped edges can easily be repaired and re-sharpened using a diamond grinding stone.
- Storage: Wipe away dust, moisture, and debris immediately after use. Store in a dry location.