Concrete Floor Grinding Machine380v 3ph 60hz 5 5 Hp. concrete floor grinding machine380v 3ph 60hz 55 hp. STI 2807 PrepMaster Grinder Polished Concrete, STI 2807 Prepmaster Concrete Floor Grinder and Polisher is ideal for projects greater than 5,000sf 75HP 3PH motor . get price. We provide a large number of solutions for customers in more than 160 countries/regions around the world, and are ...