[w/ EN manual] ALTSTONE RIN #1000 & #5000 Ceramic Sharpening Stones Set for Knives

ALTSTONE RIN #1000 & #5000 set
[English ver.] Includes English manual


RIN – High Density. Precise Edge. Compact Form.

Hard & Dense Ceramic Whetstone Set for Medium & Finishing (#1000 / #5000) with Nagura
ALTSTONE RIN whetstone set includes a #1000 medium grit and a #5000 finishing stone. These Japanese-made ceramic sharpening stones offer professional-level sharpening at home with Splash & Go convenience.

[Features]
High Grinding Power: WA abrasives deliver consistent sharpening performance with dense ceramic construction.
Versatile Application: Effective for both stainless and high-hardness steel kitchen knives.
Non-Slip Mat Included: Ensures safe and stable sharpening without a whetstone stand.
Thorough Inspection: Each item is quality-checked by both manufacturer and seller before shipping.

[Specifications]
RIN is ALTSTONE's Hard/Dense type whetstone.

✅RIN1000 – Medium Sharpening Stone
Grit: #1000 (Medium)
Stone Size: 180 × 60 × 20 mm (7.1" × 2.4" × 0.8")
Nagura: 60 × 25 × 20 mm (2.4" × 1.1" × 0.8")
Weight: 430g (Main) / 70g (Nagura)
Type: Splash & Go (No soaking required)

✅RIN5000 – Finishing Sharpening Stone
Grit: #5000 (Finishing)
Stone Size: 180 × 60 × 20 mm (7.1" × 2.4" × 0.8"), Compact size ideal for home use.
Nagura: 60 × 25 × 20 mm (2.4" × 1.1" × 0.8")
Weight: 520g (Main) / 70g (Nagura)
Type: Splash & Go (No soaking required)
Planned by ALTWAYS.LLC and proudly manufactured in Japan.

ALTSTONE: Precision-engineered 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.

How to Sharpen a Knife with ALTSTONE
▶ Watch our sharpening tutorial on YouTube:
https://www.youtube.com/watch?v=v7rpC0RKRgI&t=12s