Jamshedji Construction Machinery Co. Offers Walk Behind type Centrifugal Roller. Jamshedji Construction Machinery Co. Is an ISO 9001: 2008 accredited company supplying a wide range of construction machines like pumps, mixers, cutters, rollers, rammers and vibrators. The Walk Behind type Centrifugal Roller operates on a frequency of 4620/rpm and has a walking speed of 1.6 km/hr. The Walk Behind type Centrifugal Roller provides a working width of 560 mm.