Blade Size: 3"Starlock Interface For Professional Performance , Also Works With OIS Compatible Tools Including Bosch, Fein, Milwaukee, Makita, Rigid And MorePremium Carbide Grit Coating For Long Life In Grout And Tile ApplicationsLarge Delta Shaped Surface Area For High Removal Rates Of ThinsetColor Coded Interface And Laser Etched Blade To Quickly Identify The Right Blade