The Festool 769166 DIA STONE-D130 PREMIUM Diamond Disc is a 130 mm diamond grinding disc made for surface prep on extremely hard materials and hard concrete. This is a diamond disc designed for grinding very hard concrete and masonry substrates. Model Number: 769166. If you are running a Festool RG 130 ECI or RG 130 and need an accessory that holds up on demanding concrete work, this is the disc built for that job.

What matters here is not just the diameter, but how this wheel is set up for hard material removal. Festool rates it for very hard materials and hard concrete harder than B35, which makes it a focused accessory rather than a general-purpose wheel. That matters on the job because hard concrete can burn through lighter accessories fast. A disc built specifically for that material keeps cutting and grinding more consistently instead of glazing over early.

The 7 mm segment height is one of the key details. In plain terms, that gives you more usable diamond segment to work with over the life of the disc. Combined with Festool's premium construction, the result is longer service life when you are grinding on hard, abrasive surfaces. If you do repeated concrete surface prep, coating removal on hard substrates, or correction work where the base material is tough, that durability pays off.

This disc is sized at 130 mm with a minimum arbor diameter of 25 mm and a maximum inner diameter listed at 22.2 mm. It is designed to match the Festool RG 130 platform, so fitment is not a guessing game when you are already running that machine. Festool also calls out easy disc changes in just a few steps, which is a practical benefit when you need to switch accessories between passes or move from one stage of grinding to the next.

Jobsite practicality is a big part of why someone buys a disc like this. Surface prep work is rough on accessories, and hard concrete is one of the fastest ways to expose weak grinding wheels. This Festool diamond cup disc is built for wet or dry use, and it is rated for up to 11,750 RPM, so it is meant to work at the speeds these concrete grinders run. That gives pros a disc that matches the machine and the material instead of forcing a compromise.

Compatibility is straightforward. The DIA STONE-D130 is suitable for the Festool RG 130 ECI and RG 130 grinders. If that is your platform and your work leans toward hard concrete or very hard mineral-based substrates, this is the right style of accessory to keep on hand. It is especially relevant for concrete contractors, remodeling crews doing slab or substrate correction, and anyone handling masonry surface prep with the RG 130 system.

Who should buy it? Buy this if you already own a Festool RG 130 series grinder and regularly deal with very hard concrete where accessory life and consistent grinding matter. If you only occasionally touch softer material, this may be more specialized than you need. But for hard-substrate grinding, that specialization is exactly the point.

Festool 769166 DIA STONE-D130 PREMIUM Diamond Disc for Hard Concrete Work

This is the disc you buy when your material is hard enough to punish anything less specialized.

• Who it's for: Pros running a Festool RG 130 ECI or RG 130 for concrete and masonry surface prep on very hard substrates.
• Why it stands out: The 7 mm segment height, hard-concrete focus, and Festool-specific fit make it a purpose-built grinding accessory instead of a generic cup wheel.
• Worth knowing: This is a specialized diamond grinding disc. If your work is mostly softer material, it may be more disc than you need, but for hard concrete it makes a lot more sense.

• What tool does this disc fit? It is suitable for the Festool RG 130 ECI and Festool RG 130 grinders.
• What material is this disc meant to grind? Festool lists it for extremely hard materials and hard concrete harder than B35. Supplementary data also identifies stone and masonry use.
• Can it be used wet or dry? Yes. Supplementary product data lists the disc for wet and dry use.
• What size is the disc? The disc diameter is 130 mm, or 5-1/8 inches.