Diamond Concrete Shaver/Rectifier with hydrostatic Drive, self-propelled, The Shave-Master SM-320 works on the same principle as the RM-320. The drum is enclosed in the main body of the machine and rotates at high speed. The difference is that the drum is made up of a number of “Diamond Blades” which produce fast and efficient results on different surfaces, come with electric motor 11 KW, 15 KW & 18 KW or Petrol Engine 20 HP with working width 320 mm.