ALTSTONE RIN Sharpening Stone Set #1000/#5000/#10000 | Made in Japan
ALTSTONE RIN whetstone set includes a #1000 medium grit, a #5000 finishing stone, and a #10000 super fine stone. These Japanese-made ceramic sharpening stones offer professional-level sharpening at home with splash and go convenience—no soaking needed.
RIN1000 – Medium Sharpening Stone
RIN5000 – Finishing Sharpening Stone
RIN10000 – Super Fine Finishing Sharpening Stone
Planned by ALTWAYS.LLC and proudly manufactured in Japan.
In Japan, sharpening blades has never been just the work of professionals. For many years, people have used whetstones at home to keep their kitchen knives sharp—it’s a tradition deeply rooted in daily life.
This culture has shaped the evolution of Japanese sharpening stones themselves. Brands like Shapton, King, Naniwa, and Suehiro have each developed their own technologies and philosophies, refining bonding methods, abrasive design, and sharpening feel.
Japan has developed a particularly rich and refined sharpening culture. Few other countries offer such a wide variety of products tailored to different blade types, with such careful attention to sharpening feel and finish. In terms of materials, structure, and craftsmanship, Japanese sharpening stones continue to set a high standard globally.
ALTSTONE offers products that reflect the refinement and subtlety of Japan’s sharpening culture. For example, our RIN series is engineered for durability and performance, featuring a hard and densely compacted structure that resists wear and maintains flatness over time.
RIN achieves a high-level balance of hardness and cutting power through optimized bonding techniques and surface treatment, making it well-suited for tasks that demand precision and clean finishing.
Sharpening may not be flashy. But there’s something quietly special about the meal you prepare with a freshly sharpened blade. We hope that an ALTSTONE whetstone can be part of that small but meaningful change in your everyday cooking.