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Water Stone Upgrade Kit

Original price $79.98 - Original price $79.98
Original price
$79.98 - $79.98
Current price $79.98
in stock, ready to be shipped
  • Includes Flattening Stone and Stone Holder
  • Large 10" x 4" Flattening Stone
  • Stone Holder Holds Stones up to 8.5" Long
  • Special Combined Savings!

A Kit to Upgrade Your Water Stones

Water stones have many great features that make them so popular. But to make them perform at their best, they must be properly maintained. The Double-Time Flattening Stone is a great way to keep your water stones flat. It features a two-sided dual-grit and a large size for fast and effective water stone flattening.

Water stones also greatly benefit from having a stone holder. Our universal stone holder works with any of our water stones. We use this stone holder in our shop and expect you'll enjoy using it as much as we do.

And to make it a little easier to enjoy the benefits of both the flattening stone and the stone holder, we have combined the two at a great price.

Designed to Work with These Water Stones

  • Naniwa Sharpening Stones
  • Naniwa Professional Stones
  • Naniwa Traditional Stones
  • Naniwa Speciality Stones
  • Naniwa Economical Stones
  • Norton Water Stones
  • Shapton Professional Stones
  • Sharpening Supplies Water Stones

The Double-Time Flattening Stone

The First Double-Sided Dual Grit Flattening Stone

When we set out to create the ultimate flattening stone, our objectives were to create the best flattening stone possible, while still keeping it affordable. We met our goals and we're happy to show you the finished product.

When creating the stone, we first had to define what made a great flattening stone. We came up with 5 important factors.

  • First - It must be very flat.
  • Second - It must be large enough to flatten any water stone with ease.
  • Third - It must be made with the best material.
  • Fourth - It must flatten all water stones quickly and leave a good finish.
  • Fifth - But, certainly not least important - It must be made in the USA.
Double-Time Flattening Measure Flatness

Guaranteed Flat

When our flattening stone is made, care is taken to ensure that it comes out of the mold flat. That flatness is critical because that is what determines how flat you can make your stone. We take two additional steps when ours are made. First, each stone is hand lapped to ensure flatness. It takes time to do it, but that is the only way to make it flatter. Second, each stone is precisely measured to ensure flatness. If it doesn't pass the test, it is sent back for additional lapping.

Double-Time Flattening Stone Size Comparison Flattening Stone Size Matters

The size of the flattening stone matters for a few reasons. The larger stone is easier to use as your water stone stays on the surface. But total wear is another benefit. Our large (10" x 4") double-sided stone has 80 square inches of total flattening surface. That is almost 3 times the wearable area of other popular flattening stones.

Seeing the Double-Time Flattening Stone next to other popular flattening stones shows the size difference. And, it's double-sided!

Double-Time Flattening Abrasive Close-Up Hard Abrasive Materials

We chose green silicon carbide as our abrasive material for our flattening stone because it is extremely hard and the particle shape cuts aggressively. It is harder than aluminum oxide, and also harder than the less expensive black silicon carbide. This makes it ideal for flattening as it cuts quicker and wears slower.


Double-Time Flattening Stone In Use Photo Two Sides for Fast Flattening and Smooth Surfaces

Just like with sharpening an edge, the coarser the grit the faster the cutting action. However, the coarser the grit the coarser the surface it will leave. We experimented with different grits to find the best overall option. We wanted to find a better solution to that compromise. Our solution was to make it double-sided. Something we have not seen on any other flattening stone before.

The coarse side is a very fast cutting 120 grit. Especially when working on coarse water stones, this side provides the necessary cutting action to effectively flatten the stone. However, when flattening finer stones, a coarse grit leaves a finish that many find undesirable. That is why we put a 320 grit surface on the fine side. On water stones 1000 grit and higher, we recommend using the fine side to put a nice surface finish on the stone. The fine side can even be used alone on very fine water stones to put a fresh flat surface on your stone.

In addition, the distinctive grid pattern of the grooves clears waste material quickly and efficiently, aiding the fast cutting action on both sides of the Double-Time Flattening Stone.

Made In the USA

We've supported US manufacturing since we started and that continues to be important to us. When we set out to create our new flattening stone, we knew we could make a great flattening stone in the US. We feel that everyone benefits when quality products are made in the USA. We're not only supporting the economy, but we are producing a product with a quality that everyone can appreciate.

100% Satisfaction Guarantee

We're so confident that you'll like the Double-Time Flattening Stone that we're backing it up with a 100% satisfaction guarantee. If you're not happy with any aspect of the stone, just let us know and we'll gladly replace or refund your purchase.

Universal Stone Holder

Universal Stone Holder

If you are going to buy just one stone holder, this is the one. We have tested it and found it holds stones between 5 1/2" and 8 1/2" long. Although intended primarily for water stones, it works equally well on diamond and oil stones; the stones do not know the difference. The rubber feet keep the stone from sliding around and have the added benefit of raising the stone 7/8" above the work surface, just enough to easily make room for your hands while sharpening. The sturdy chrome plated steel rails are corrosion resistant.

Q. Does this stone holder work with all water stones?

A. Yes, we've tested it on many different water stones and it works well on all water stones.

Q. Does this stone holder hold the Double-Time Flattening Stone?

A. No. While the Universal Stone Holder does hold any of the water stones we offer, the Double-Time Flattening Stone is too large for it to accommodate.

Need more information?

Call a Product Specialist

Monday through Friday, 8 a.m. - 4 p.m. CT
Phone U.S.: 1-800-351-8234

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