Removing old grout is a unique skill that has made the oscillating multifunction tool a favorite among tile setters and bathroom installers. However, mortar can be a challenge: only the best blades can withstand the regular demands that professionals place on their multitools. The EXPERT ACZ 85 RD4 blade offers an extremely long lifespan thanks to its advanced diamond insert. Bosch Diamond Technology provides a fine cutting edge made of high-quality diamond grains, which offer maximum wear resistance in hard mortar. These grains are tough enough to give the blade a new dimension: you can also make small adjustment cuts in soft tiles.