Road Roller,Shandong Hongda Laiyang City,Shandong Province ... The YZ20, YZ18 and YZC12 types of road rollers are all-hydraulic vibratory rollers independently designed ... different characters and different thicknesses, for example, in road, railway, airport, harbor and water conservancy construction ... can be opened as a whole adopt the pneumatic boosting technology, which makes daily maintenance easy and ...