1-1/4" Non-Sanded Grout Removal Wheel for your Dremel® - DuraGRIT® GW4
The best grout removal tool you can get on Amazon
Dremel 568 Electric Wall and Floor Grout Removal Kit, Grout Remover Attachment for Rotary Tool with Angled Cutting Guide and 1.6 mm Grout Removal Bit : Amazon.co.uk: DIY & Tools