ALTSTONE RIN High Density Ceramic Sharpening Stones for Knives | from Japan

RIN – High Density. Precise Edge. Compact Form.

Hard & Dense Ceramic Whetstone — ALTSTONE RIN Series (#1000, #3000, #5000, #8000, #10000) with Nagura

The ALTSTONE RIN Series delivers professional-level sharpening in a compact format with Splash & Go convenience. Proudly made in Japan, the series includes #1000, #3000, #5000, #8000, and #10000, covering the full cycle from edge setting to high-polish finishing.

Features

• High Grinding Power: WA abrasives and a dense ceramic body provide stable, predictable sharpening.
• Hard & Flat: RIN’s high-density structure resists wear and helps maintain flatness.
• Versatile Steel Compatibility: Works well with stainless and high-hardness steels.
• Nagura Included: Helps generate slurry and refresh the surface during sharpening.
• Non-Slip Mat: Safe, stable sharpening without a separate stand.
• Dual Inspection: Each item is quality-checked by both the manufacturer and the seller before shipping.

Grit Guide

• #1000: For edge setting, repair, and routine maintenance.
• #3000: For refining edges with a smooth cutting feel.
• #5000: For daily finishing with a crisp, precise bite.
• #8000: For fine finishing and delicate push cuts.
• #10000: For ultimate high-polish finishing and maximum sharpness.

Specifications

RIN is ALTSTONE’s hard/dense type whetstone.

• Available Grits: #1000, #3000, #5000, #8000, #10000
• Stone Size: 180 × 60 × 20 mm (approx.)
• Nagura Size: 60 × 25 × 20 mm (approx.)
• Weight: ~500–600 g (main stone) / ~70 g (nagura)
• Type: Splash & Go (no soaking required)

Planned by ALTWAYS LLC and proudly manufactured in Japan.

ALTSTONE: Precision-Engineered in Japan

In Japan, sharpening has long been part of daily life, not just professional work. This culture shaped today’s whetstones—refined bonding, abrasive design, and a focus on sharpening feel and finish.

ALTSTONE reflects that refinement. The RIN series is built for durability and precision, with a compact, high-density structure that resists wear and keeps the surface true. It balances hardness and cutting power for clean, accurate results.

Sharpening may be quiet work, but a freshly sharpened blade can transform everyday cooking. We hope an ALTSTONE whetstone becomes part of that small, meaningful change in your kitchen.

How to Sharpen with ALTSTONE

▶ Tutorial on YouTube:
https://www.youtube.com/watch?v=v7rpC0RKRgI&t=12s

Transaction Conditions

Shipping

• Ships directly from Japan to your country.
• Shipping fees vary by destination; add the item to cart to see the final shipping cost.
• We can also ship to a domestic forwarding service in Japan. Shipping within Japan is free in this case.
• All shipments include a tracking number and insurance.

Customs & VAT

• Buyers are responsible for any import duties, taxes, or VAT.
• These fees are not included in the item price or shipping cost.
• Charges vary by country and are typically paid to your local customs office or carrier upon delivery.
• The final cost may exceed the item price depending on local import regulations.

Return Policy

Returns accepted within 30 days of receipt. Items must be in original condition. Buyer pays return shipping. Refund processed after inspection.