Arrived promptly. Bosch angle grinder, appropriate spacing ring did not fit - be aware they are graduated in size, one should fit. As often is the case, I had to bodge the outlet to vac connection, is 32mm 'standard'? Why not offer options? In use, with 'moderately' regular mortar, very soft, I found the smaller 8mm cutter best. If needed, run the cutter back and forward after a 'forward' cut (which the vac clears best) to clean back to the brick. For edges, corners, 'tight' gaps, I used a 6mm masonry bit in my battery drill. Worked well. I cleared 9 sq metres in about 5 hours. The cutter showed signs of wear, but not significant. A good tool for the diy person.