Bosch OSC312RF 3-1/2 In. x 1/8 In. Kerf Multi-Tool Carbide/Grit Grout Grinding Blade The Bosch 3-1/2 in. x 7/8 in. Grout Blade for Oscillating Tools is designed for removing grout in between accent tiles and other closely set tiles. It has a 12-pin interface and is compatible with a wide range of oscillating power tools. Directly compatible with OIS tools Also compatible with other tools fitted with an OIS adapter Carbide blade with a black finish Ideal for removing grout between closely set tiles 12-pin interface