Harbor Freight sharpening stone stock is cheap, and it stays cheap for a reason. Right now the lineup is a basic combination oil stone and a diamond hone block, both well under fifteen dollars. Neither one was built with a fine kitchen knife in mind.
Both tools work fine for rough jobs. Garden tools, axes, and beater knives take well to them. A good kitchen knife or a nice pocket knife deserves better steel prep than either one offers.
This page grades what the shelf actually holds today, not what shoppers remember from years ago. Stock changes, so we checked the current listing before writing a word of this. Below is the honest read, plus where a real stone earns its price.
What Harbor Freight Actually Stocks in Sharpening Stones
As of our latest check, Harbor Freight lists exactly two items in this category. The GORDON Combination Sharpening Stone runs under five dollars and pairs a medium grit side with a fine grit side. The GORDON Four Sided Diamond Hone Block runs under fifteen dollars and carries four grits on one block.
The combination stone measures roughly seven inches by two inches. The medium side can be used wet or dry, but the fine side wants honing oil to work right. Skip the oil on that side and you will mostly polish your patience.
The diamond block covers 200, 300, 400, and 600 grit across its four faces. It uses water instead of oil, and the maker bonds the diamond layer to a steel core inside a plastic mount. There is no separate multi plate diamond set currently listed, and no round puck style stone either, so do not plan a trip around either one without checking the current page first.
The Honest Quality Read
The soft binder in the combination stone dishes fast under regular use. That is common at this price, but it means the flat face will not stay flat very long. Coarse grit ratings on stones like this tend to run optimistic too, and this one is no exception.
Owner reports on the combination stone are blunt about it. The most common complaint is that the stone is too coarse to leave a genuinely sharp edge on a good knife. It removes metal fast and finishes rough, which fits its price but not fine cutlery.
Reports on the diamond hone block split in two directions, and we are not averaging them. One group finds the grit performance close to name brand diamond stones costing three times as much, especially on tough steels. Another group reports the printed grit numbers do not match the actual cutting speed, with some units feeling coarser or finer than the label says.
Where These Stones Are Genuinely Fine
Both tools earn their keep outside the kitchen. Garden tools, axes, and mower blades do not need a mirror edge, just a working one. A cheap stone that dishes fast is not a real problem on tools you swing at dirt.
They also make sense for beater knives, the ones already covered in nicks and scratches. They are also a low cost way to learn stroke angle and pressure control before you spend real money on a fine stone. Ruin a stone this cheap while you learn technique, not a pricier one you plan to keep.
Chainsaw teeth need a round file or a dedicated grinder, not a flat stone. Our guide to that specific chainsaw sharpening tool covers the job directly.
| Model | Type | Best for | Price band | |
|---|---|---|---|---|
| GORDON Combination Stone | Oil stone, medium/fine | Garden tools, axes | Under $5 | |
| GORDON Diamond Hone Block | Diamond, four grits | Learning strokes, beaters | Under $15 | |
| Sharp Pebble 1000/6000 | Waterstone combo | Kitchen knives, EDC | $$ | See Price |
| King KW65 1000/6000 | Waterstone combo | Kitchen knives, everyday sharpening | $$ |
When a Real Stone Pays Off
Good steel deserves better abrasive than a dished stone or a mystery grit. Once you own a knife worth keeping sharp, a real waterstone pays for itself fast. A combination stone covers most home needs without a big investment.
For the full picture on choosing between stone types, our guide to picking the right stone for your knives walks through the tradeoffs.
Sharp Pebble 1000/6000
Best Value
Waterstone combo | 1000 grit repair side | 6000 grit polish side
This is a step up in category, not just price. The 1000 side resets a dull edge in a fraction of the strokes a basic oil stone needs. The 6000 side leaves a finish no cheap combination stone can match.
Like any waterstone, it needs soaking before use and periodic flattening after. That is more upkeep than a grab and go oil stone. For a knife you actually care about, the tradeoff is worth it.
Pros
- Covers repair and polish in one stone
- Noticeably finer finish than either budget option
- Common size fits most home sharpening setups
Cons
- Needs soaking, unlike the oil stone
- Requires occasional flattening to stay accurate
King KW65 1000/6000
Best Overall
Waterstone combo | plastic base included | 1000/6000 grit
King has sold combination waterstones for a long time, and the KW65 is the version most home cooks land on. The plastic base keeps the stone stable and off the counter while you work. The manufacturer lists the same 1000 and 6000 grit split as the Sharp Pebble.
It asks for the same care any waterstone needs: soak it, flatten it now and then, store it dry. That upkeep buys an edge a basic combination stone cannot deliver on its own.
Pros
- Included base keeps setup simple
- Long standing brand with a wide owner base
- Same repair to polish range as the Sharp Pebble
Cons
- Aluminum oxide wears faster than resin bonded stones
- Base takes up more storage space than a bare stone
Our deeper look at King’s stone lineup covers the KW65 alongside the rest of the brand. Curious why 1000 grit shows up on both of these stones? Our look at why 1000 grit anchors most sharpening kits explains the logic.
For more picks across the category, browse our broader shelf of stone and abrasive reviews.
The Diamond Block Flatness Lottery
Buying the diamond hone block is a bit of a lottery on quality control. Some owners get a block that tracks its printed grits closely. Others get one with loose mounting hardware or grits that run noticeably off from the label.
There is no way to know which one ships to your store. Check the block against a known reference before you trust the numbers on the label. At this price, that five minute check costs you nothing.
Mistakes to Skip
Do not use the fine side of the combination stone dry and expect good results. It wants honing oil, and skipping it just glazes the surface. That turns a fine stone into a slow, frustrating one.
Do not assume every diamond hone block performs like the one in a single review. Quality control varies enough that you should verify grits yourself. And do not expect a stone this cheap to finish a good kitchen knife the way a fine waterstone will.
The bottom line: Harbor Freight sharpening stone stock is fine for garden tools, axes, and learning your stroke. For a knife you actually care about, move up to a real combination waterstone like the King KW65. It costs more than either budget tool, and it earns that gap back in edge quality.
Frequently Asked Questions
Does Harbor Freight sell diamond sharpening stones?
Yes. The current lineup includes a four sided diamond hone block with 200, 300, 400, and 600 grit faces, priced under fifteen dollars.
Is this sharpening stone any good for knives?
It works for rough repair on tools and beater knives. Owner reports call it too coarse for a genuinely sharp edge on a good kitchen knife.
What grit is the combination stone?
It pairs a medium grit side with a fine grit side. The maker recommends honing oil on the fine side for it to cut properly.
Can I use the diamond hone block dry?
No. The maker designs it for water, not oil. A quick splash before use keeps it cutting cleanly and stops swarf from clogging the surface.
How often does stock change?
Store stock rotates by location and season. Always check the current listing before a trip, especially for a narrow category like sharpening stones.
What is a better upgrade from these stones?
A combination waterstone like the Sharp Pebble 1000/6000 or the King KW65 1000/6000 covers repair and polish in one stone, with a finish neither budget tool can match.
Sources
- Harbor Freight Tools: GORDON Combination Sharpening Stone product listing. https://www.harborfreight.com/combination-sharpening-stone-62852.html
- Harbor Freight Tools: GORDON Four Sided Diamond Hone Block product listing. https://www.harborfreight.com/4-sided-diamond-hone-block-92867.html
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