Handcarts are widely used in production and daily life due to their low cost, simple maintenance, ease of operation, light weight, and ability to operate in places where motor vehicles are not convenient. They are particularly convenient for short-distance transportation of lighter items, making the task of carrying goods more labor-saving, time-saving, and cost-effective. Wheelbarrows can navigate narrow gangways, temporary bridges, and narrow paths, allowing for easy maneuvering and unloading. Common two-wheeled carts include hand trucks for carrying individual items (also known as tiger carts), trolleys, and dump trucks for loose materials. In three-wheeled hand trucks and four-wheeled hand trucks, there are two swivel feet that can rotate around a plumb axis (see image of swivel feet). These swivel feet automatically adjust to the direction of lesser running resistance as the vehicle changes direction during operation.