タイトルまたは説明

Steel flat trolley, trolley has a single wheel, two wheels, three wheels and four wheels. The unicycle can be driven on narrow diving boards, easy bridges and sheep paths, able to turn in place and dump the goods very convenient.
Commonly used two-wheeled vehicles are hand-pushed handling car (also known as trolley), rack car and handling bulk materials bucket car. There is one three-wheeled trolley and two four-wheeled trolleys with slewing casters that can rotate around the plumb axis. These slewing casters can automatically adjust to the direction of least resistance in operation as the direction of vehicle movement changes.