1st blade, carbide grit-edge: these avoid kerf tear-out for more precise and smoother cuts. PLUS, they are long-lasting and can withstand consistent pressure during operation.
2nd blade, serrated
Use of both blades: when combined, the serrated blade helps move the grout dust off to cut through the material (for ultimate results, use only one blade for walls & thin grout lines, and both blades for floors and thicker grout lines.
