Miki Giken Koyasuke Stone Chisel / Hammer — 40mm Bladed Face, Carbide Tip 8x11x40mm, Oak Handle, Total Length 330mm

OVERVIEW & PRODUCT DESCRIPTION
Achieve maximum-width heavy-duty natural stone shaping, professional masonry trimming, and efficient wide stone surface reduction with exceptional durability and traditional craftsmanship using the Miki Giken Koyasuke Stone Hammer (Model #591), featuring the largest 40mm bladed face.

Crafted in Miki, Japan—a city renowned for centuries of master blacksmithing—this specialized flagship Koyasuke features a large, high-grade tungsten carbide cutting edge (8x11x40mm dimensions) embedded into a sharp, bladed 40mm striking face. Mounted on a sturdy, shock-absorbing Japanese oak wood handle (樫柄 - 330mm total length, 125mm head length, massive 850g heavy-duty head weight), it delivers maximum impact momentum, structural rigidity, and controlled striking power for demanding wide-surface stone dressing and masonry work.

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

KEY FEATURES & SPECIFICATIONS
- Heavy-Duty Large Carbide Tip (超硬チップ 8×11×40mm): Equipped with a massive tungsten carbide insert (8x11x40mm) designed to withstand intense impact shock while maintaining a sharp cutting edge against hard stone across a broad surface.
- Bladed Cutting Face (刃付 40mm): Features a sharp, precision-ground 40mm bladed edge optimized for efficient wide stone trimming, chipping, and detailed surface reduction.
- Ergonomic Japanese Oak Wood Handle (柄付き): Fitted with a durable, resilient natural oak handle, providing excellent shock absorption and a secure grip during repetitive heavy striking.
- Heavy-Duty 850g Head & 330mm Reach: Engineered with an overall length of 330mm, an extended head length of 125mm, and a massive 850g weight (全長330ｍｍ・頭125ｍｍ・重量850ｇ) to deliver maximum impact momentum and deep stone-shaping efficiency.
- Professional Stonemasonry Utility: Ideal for wide stone trimming, heavy surface dressing, stone shaping, masonry joints, and traditional Japanese garden stone construction.
- Handcrafted in Japan: Built with the uncompromising quality expected of traditional Japanese tool makers.

- Specifications:
  - Brand: Miki Giken (三木技研)
  - Model: #591 (コヤスケ 刃付 40ｍｍ 樫柄付き)
  - Total Length: 330mm (全長 330ｍｍ)
  - Head Length: 125mm (頭長 125ｍｍ)
  - Face Type: Bladed cutting face (刃付)
  - Face Width: 40mm (40ｍｍ)
  - Carbide Tip Dimensions: 8 x 11 x 40mm (超硬チップ8×11×40)
  - Head Weight: 850g (重量 850ｇ)
  - Handle Material: Japanese Oak Wood (柄付き)
  - Origin: Made in Japan

IMPORTANT USAGE & CARE GUIDE FOR CARBIDE TOOLS
- Full-Face Strike Alignment: Always ensure the entire striking surface makes flat, precise contact with the stone. Striking at an angle (hitting on points or corners only) will cause the delicate carbide tip to chip.
- 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 high-hardness tools, improper striking angles may cause minor chipping along the edges. This is a normal characteristic of carbide 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.