Knife sharpening

162N Double-sided Diamond Sharpening Stone, 8 in. x 3 in.

The Sharpal 162N provides an 8-by-3-inch monocrystalline diamond plate mounted to a substantial steel core, pairing 325-grit coarse and 1200-grit extra-fine surfaces. At $69.99, it serves as a fast-cutting foundation for edge reprofiling and maintenance, though fine finishing requires secondary refinement.

162N Double-sided Diamond Sharpening Stone, 8 in. x 3 in.
Price

$69.99

Amazon rating

4.7

4.7
Ratings

4,014

Best for Sharpening high-hardness steels with zero stone maintenance

Diamond abrasive plates provide a permanently flat surface that never dishes and cuts hard, wear-resistant steels with minimal effort. This double-sided 8x3-inch block eliminates water soaking and slurry cleanup entirely. The scratch pattern is more aggressive than that of equivalent water stones, requiring a disciplined, light hand.

What we like

  • Never requires flattening or water soaking
  • Cuts advanced tool and stainless steels effortlessly
  • Spacious 8 by 3 inch surface area

What to weigh up

  • Higher initial price point
  • Diamond scratches require careful refining on fine edges
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Price and rating were captured on 28/09/2026 and change often. We earn a commission on qualifying purchases.

Our scorecard

Weighted against our category rules
8.2out of 10
Overall
  • Build quality8.8

    Massive 1.4 kg assembly with a 0.35-inch stainless steel core ensures stability.

  • Surface flatness9.0

    Steel diamond plate maintains continuous planarity without the dishing common to waterstones.

  • Grit versatility7.4

    The 325/1200 spread handles repair and basic sharpening, omitting true polishing stages.

  • Angle assistance7.2

    Included plastic wedge provides basic angular reference rather than fixed mechanical guidance.

  • Overall value8.6

    Strong balance of durable abrasive material, physical mass, and reasonable pricing.

The full review

Design and Build

The Sharpal 162N centers on a solid 0.35-inch thick stainless steel plate measuring eight inches in length by three inches in width. At an overall package weight of 1.4 kilograms, the tool possesses sufficient inherent mass to resist shifting across a workbench during heavy stock removal. The monocrystalline industrial diamonds are electroplated directly onto both sides of this steel slab, delivering a coarse 325-grit surface on one face and a 1200-grit surface on the reverse. Unlike traditional clay- or resin-bonded waterstones that dish over time, this metallic substrate remains inherently flat, removing the need for dedicated flattening plates. The included housing doubles as an elevated sharpening station, equipped with non-slip rubber footing on its base to retain the plate securely. Construction tolerances are tight, though the included plastic angle guide—molded with 14, 17, 20, and 25-degree reference points—is a loose secondary aid rather than an integrated jig.

Real-World Performance

Abrasive electroplating enables rapid material removal on demanding metallurgy, including high-speed tool steels, ceramic, and carbide that typically stall conventional synthetic stones. The 325-grit face (45 microns) establishes secondary bevels, repairs minor edge rolling, and removes micro-chips within only a few dozen alternating passes. Transitioning to the 1200-grit face (12 microns) refines scratch patterns into an aggressive, toothy working edge. Operating dry or with water is viable; the absence of oil simplifies cleanup significantly. However, users adhering to standard kitchen knife geometry must contextualize these grit ratings. Our baseline recommendation for kitchen cutlery favors a 1000/6000 progression. While the Sharpal 1200-grit side forms a clean apex capable of clean push cuts through newsprint, it produces a distinct micro-serration rather than the polished refinement of a 6000-grit waterstone. The four-angle guide helps check orientation, but maintaining angle consistency ultimately relies on manual muscle memory.

Value for Money

Priced at $69.99, the Sharpal 162N competes directly with premium bench stones and budget-tier guided systems. A user rating of 4.7 out of 5 across more than 4,000 recorded reviews reflects strong market satisfaction regarding durability. When compared to synthetic waterstones in the same price tier, the diamond format offers substantial lifetime savings by eliminating stone-flattening accessories and abrasive slurries. Sharpal backs the tool with a three-year manufacturer commitment. The inclusion of a robust plastic base and angle-check block completes a functional package without requiring separate stone holders, which often cost an additional $15 to $25. Buyers who maintain extensive workshop tools, garden equipment, or abrasion-resistant pocket-knife alloys will derive high return per dollar here, as electroplated monocrystalline diamond handles difficult alloys without the surface gouging that softer waterstones suffer from when encountering narrow gouges or chisels.

Who Should Skip It

Dedicated culinary enthusiasts aiming for razor-polished, push-cutting edges on delicate Japanese kitchen knives should skip this as a standalone solution. Because the 1200-grit finish tops out at 12 microns, it lacks the fine refinement of a 6000-grit polishing stone, making supplementary high-grit stones or dedicated stropping mandatory for high-end cutlery. Complete novices seeking fully automated bevel consistency should also look elsewhere; the bundled angle wedge merely checks hand positioning at rests, unlike true guided rod-and-clamp setups that mechanically eliminate tilt. Finally, users who strictly sharpen softer European kitchen steels at high frequencies will find the aggressive diamond matrix unnecessarily harsh compared to softer aluminum oxide stones that offer greater tactile feedback and more forgiving scratch removal rates during routine maintenance sessions.

Specifications

As listed by the manufacturer
Brand NameSHARPAL
Number of Items3
ManufacturerSharpal Inc.
Number of Packs1
Item HighlightCoarse 325 / Extra Fine 1200 Grit, Storage Case with NonSlip Base, Angle Guide, Knife Sharpener
Unit Count1 Count
UPC814744028042
Model Number162N
Manufacturer Part Number162N
Material TypeMonocrystalline Diamond
ColorBlack and Silver
Grit TypeCoarse, Extra Fine
Item Dimensions L x W x H8.46"L x 3.94"W x 1.93"H
Item Weight1.4 kg
1K+ boughtin past month

What the maker claims

  • FAST, Durable and Heavy-Duty: Industrial monocrystalline diamonds are electroplated onto a stainless steel base of 0.35 inch thickness. Up to 5 times faster sharpening than oil stone, water stone
  • DUAL GRIT: Coarse 325 grit (45 micron) for quick edge setting; Extra fine 1200 grit (12 micron) for honing. Sharpen and Hone HARD Material including High Speed Steel, Carbide, Ceramic & Cubic Boron Nitride. Sharpen dry. No messy oil or water needed.
  • Super FLAT Surface: SHARPAL exclusive MirrorFlat technology guarantees long-lasting even contact with knives or tools, while oil stone and water stone easily wear down with uneven surface
  • Superior Bonus Pack: Includes storage box with non-slip rubber pad that can be used as a stone base while sharpening; With Sharpening Angle Guide integrated with 4 universal angles-14°, 17°, 20°, 25° and instruction manual inside of packaging
  • 3 YEARS of Commitment and Superior After-Sale Service: SHARPAL, headquartered in California, USA, with branches in Germany and Australia, provides easy and effective sharpening solutions. All products undergo rigorous testing to ensure top-tier performance and durability.

How it compares

Same category
ProductPriceRatingRatings countOur score
162N Double-sided Diamond Sharpening Stone, 8 in. x 3 in. (this one)$69.994.74,014 ratings8.2
Whetstone Knife Sharpener – 1000/6000 Grit Sharpening Stone$39.994.625,664 ratings8.1
Work Sharp Precision Adjust Knife Sharpener Kit - Fixed Angl$69.954.511,551 ratings8.1
Kota Japan 12 in. Diamond Carbon Steel Professional Knife ShGBP 14.094.47,826 ratings7.4
Complete Knife Sharpening Stone Set – Dual Grit Whetstone 40$29.994.57,223 ratings7.8

Common questions

Can this stone replace a 1000/6000 waterstone combination?
No. The 1200-grit diamond surface delivers an edge roughly equivalent to a medium-fine scratch pattern. A traditional 1000/6000 progression provides dedicated tooth on the low end and a mirror polish on the high end. You will still require a fine ceramic stone or strop for push-cutting finish.
Does this diamond plate require water or oil during sharpening?
The manufacturer rates this plate for dry operation without lubricants. However, applying a light mist of water or non-corrosive lapping fluid helps float swarf away from the diamond matrix, preventing metal particulates from packing into the pores and extending the effective cutting lifespan of the abrasive surface.
Does the included angle guide lock the knife in place?
No. The included guide is an unattached plastic wedge marked with 14, 17, 20, and 25-degree bevel angles. It serves as a static visual reference to check your blade posture before starting a stroke, rather than a mechanical clamp that actively restricts hand movement.
Is the 1200-grit side suitable for honing between full sharpenings?
While the manufacturer notes honing capability, 1200 grit removes metal rather than merely realigning folded edges. Regular honing should be executed on a smooth ceramic or steel rod; reserve this stone for sharpening when edge geometry needs actual abrasion, metal reduction, and scratch pattern resetting.

How we judge knife sharpening

  1. Rule 01

    A 1000/6000 combination stone covers almost every kitchen need.

  2. Rule 02

    Guided systems trade speed for repeatable angles — worth it early on.

  3. Rule 03

    Honing is not sharpening; you need both.

Ready to buy?

Prices move daily. Check the current listing before you decide — the figures above were captured on 28/09/2026.

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