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Internet # 318492619

Model # A90GS05

Store SKU # 1006899303

Rotary Tool 2-Piece 5/16 in. Pointed-Cone Grinding Stones

  • Universal Fit – All Accessories Compatible with All Rotary Tools
  • Made of High Grade Aluminum Oxide
  • Ideal for Grinding, Sharpening, and Deburring Material
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Product Details

About This Product

Introducing the Rotary Tool 2-Piece 5/16 in. Pointed-Cone Grinding Stones. These stones are ideal for grinding, sharpening and deburring material and Made of High Grade Aluminum Oxide. These accessories offer universal fitment and are compatible with any rotary tool including Dremel. Expand your hobby and maker capabilities with these RYOBI accessories.


  • Ideal for Grinding, Sharpening, and Deburring Material
  • Made of High Grade Aluminum Oxide
  • 1/8 in. Shank
  • 35,000 Max RPM
  • Consumable item

  • Return Policy
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Product Information

Internet # 318492619

Model # A90GS05

Store SKU # 1006899303

Additional Resources

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From the Manufacturer



Diameter (in.)

0.25 in

Product Length (in.)

1.5 in

Shank Size

1/8 in.


Accessory Fitment


Application Type

Grinding, Sharpening

Number of Pieces




Rotary Tool Accessory Type

Rotary Bit

Tip Material

Aluminum Oxide

Tip Shape


Tools Product Type

Power Tool

Used With

Sheet Metal, Soft Metals, Stainless Steel

Questions & Answers

Typical questions asked about products:

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Customer Reviews

4 out of 5

  • 4 out of 7 reviews
  • 100% recommend this product
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Showing 1-7 of 7 reviews
Work well and seems like a good deal for two
I was looking for some additional grinding stones for my Dremel tool and thought I would give these a try. They fit just fine in the Dremel tool and work well enough. They are perhaps not as nicely made as the Dremel stones - eg I don't think the tip is as squared off as the Dremel pointed cone stone (see photo), however the price is pretty reasonable for two.
  • Recommended
RYOBI Pointed-Cone Stones (2-Pack)
RYOBI introduces the Pointed-Cone Stones which comes in a 2-Pack. It works in a drill or in a Dremel. With the pointed cone I'm able to reach small areas that I couldn't with a traditional straight (flat side) bit. It is a sturdy grinding stone and doesn't disintegrate into pieces like some of the off brand stones do. For a sturdy grinding stone you should should try these.
  • Recommended
Works on hard plastic
I had a vacuum that I needed to fix. It had those locking torx screws and I needed to change the hose. I bought the torx bits to open up the housing. Needless to say the screw hole was so small I couldn't get the bit in the hole. lol I had to have something that would make the hole larger and this rotary tool did the trick. The vacuum is made out of hard plastic and I didn't have any trouble boring it out with the Ryobi grinding stone. You can use either a drill or a Dremel. Thanks Ryobi!
  • Recommended
Two pack
The Ryobi pointed grinding stone 2 pack has 1/8 shanks on them that will fit the common rotary tool if not all. These mounted grinding stones used for more than just sharpening. The cone shape makes it very useful for enlarging holes. I tried it on very thin metal where I needed to make the hole slightly larger. Then went on to a heavier metal and it worked well.
  • Recommended
The tool worked great for my needs.
  • Verified Purchase
I bought it for trimming frame to fix a tow...
I bought it for trimming frame to fix a tow hitch. It wore off very easily and half way through - it broke. This might be a good one to use for soft work or probably finishing touches.
Response from RYOBINov 30, 2022
Hello, Selk - We are disappointed that this grinding stone did not meet your expectations! We appreciate the feedback and would love to get in touch with you regarding this experience, so we can try to improve it! If you would, will you please be looking for an email from us at Reviews@RYOBItools.com? RYOBIOutdoorTools
  • Verified Purchase
  • Verified Purchase
Showing 1-7 of 7 reviews