3-1/8-Inch triangular shaped for getting into tight corners and constricted areas * Carbide grit coated for longer life and durability when aggressively removing wood, tile, adhesives, cement and mortar * Primarily used for "Grinding/Sanding" with your Oscillating Tool * Genesis Universal Quick-Fit Oscillating Tool Accessories fit most standard AND tool-free oscillating tools, including the popular Genesis GMT15A