Casters are modular components fitted to the base of objects to enable mobility. Typically comprising a wheel, bracket (wheel frame), and connecting axle/bearing as core structures, they can be attached to equipment, furniture, tools, or other main bodies via bolts, welding, or snap-fit mechanisms. This grants originally stationary objects the capability for flexible movement, steering, or positioning. At their core, castors represent a mechanical design principle that replaces sliding friction with rolling friction, substantially reducing resistance during movement and enhancing operational convenience.
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