It is great to receive feedback from our US customers. This American customer ordered our Planetary Concrete Floor Grinder R780-3 2 years ago and has been using it for over 2 years. In the past few days, the customer ordered another planetary disc grinder R780-3 due to engineering needs. Customers trust us a lot. Most of the customers who choose the floor grinding and polishing machine R780-3 are mainly used for the grinding and polishing of conc......