Bestop concave blade is the best blade that can be used for cutting sinkholes or other inside arcs. This turbo rim blade uses a soft bond for fast aggressive cuts on hard granite. Which can be run on any electric grinder. This blade also has protection on the inside and the outside of the blade to help reduce heat build up and to prevent binding. It will also give you a smoother finish.

Diameter: 4.5 Inch - 7 Inch (D115mm - D180mm);
Arbor: 7/8" - 5/8";

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