Superior Diamond Mortar Disc 115mm/4.5", Mortar Masonry Joint Raking Blade for Grinders, Repointing Raker Tool for Fast Removal of Old Mortar, Brickwork pointing : Amazon.co.uk: DIY & Tools
115 mm 4.5 Inch Mortar Rake Blade Diamond Disc (Neilsen CT0833) | DIY at B&Q