KAI WS-0800 800 Grit Whetstone | Professional Water Sharpening Stone for Kitchen Knives

The KAI WS-0800 is an 800 grit water sharpening stone designed to deliver a balanced, precise, and controlled sharpening experience for all types of kitchen knives. It is a professional-grade, intermediate sharpening stone, ideal for restoring slightly dull edges and preparing the blade for a finer finish.

Thanks to its 800 grit rating, this stone plays a key role in the sharpening process: it combines light material removal with a sufficiently fine finish for everyday use in both professional and advanced home kitchens.

Manufactured by KAI, one of Japan’s most respected brands in cutlery and sharpening tools, it guarantees quality, durability, and consistent results with every use.

800 grit whetstone: the perfect sharpening balance

The 800 grit level is one of the most versatile in knife sharpening, as it allows you to work the edge without being too aggressive or too fine.

This stone is ideal for:

• Restoring knives with dull edges but no major damage
• Refining the bevel after coarser stones (400–600 grit)
• Preparing the edge before fine polishing (1000–3000 grit)
• Maintaining everyday kitchen knives in optimal condition
• Gradually improving cutting performance

It is an essential stone in any complete professional sharpening system.

Ideal for Japanese and professional kitchen knives

The KAI WS-0800 800 grit whetstone is compatible with a wide range of knives, both Japanese and Western:

• Chef’s knives (Gyuto)
• Santoku knives
• Nakiri knives
• High-hardness Japanese knives
• Western kitchen knives
• Professional hospitality knives

Its versatility makes it ideal for both demanding home kitchens and professional environments.

Japanese KAI quality in every detail

The KAI brand is synonymous with precision and excellence in cutting tools. This sharpening stone offers:

• High-quality abrasive material
• Even wear for consistent sharpening
• Excellent control of sharpening angle
• Long product durability
• Professional-grade results

Its design is focused on stability and precision throughout the sharpening process.

How to use a water sharpening stone

The KAI WS-0800 is a water whetstone, meaning it must be soaked before use to activate its abrasive surface.

Recommended use:

• Soak the stone in water for 10–15 minutes
• Place it on a stable non-slip base
• Maintain a consistent sharpening angle (15°–20°)
• Sharpen the blade evenly across the entire edge
• Rinse with water after use and allow it to dry completely

This system provides a more precise, controlled, and safer sharpening experience than traditional methods.

Ideal for

• Professional chefs
• Restaurants and commercial kitchens
• Japanese cuisine enthusiasts
• High-quality knife users
• People looking to improve knife sharpness
• Regular kitchen knife maintenance

Benefits of the KAI WS-0800 800 grit whetstone

• Balanced and professional sharpening
• Perfect intermediate stone in the sharpening process
• Compatible with Japanese and Western knives
• Noticeable improvement in cutting performance
• Extends knife lifespan
• Safe and controlled use