Caster

Four heavy duty casters on a large subwoofer whose weight can exceed 500 pounds (230 kg) depending on driver and top loading, and must be able to withstand rough handling.

A swivel caster with a wheel lock. The vertical swivel on this type of caster cannot be locked in position.

A caster (or castor) is an undriven, single, double, or compound wheel that is designed to be mounted to the bottom of a larger object (the "vehicle") so as to enable that object to be easily moved. They are available in various sizes, and are commonly made of rubber, plastic, nylon, aluminum, or stainless steel.

单词	Castor wheel
释义	Castor wheel 英语百科 Caster A caster (or castor) is an undriven, single, double, or compound wheel that is designed to be mounted to the bottom of a larger object (the "vehicle") so as to enable that object to be easily moved. They are available in various sizes, and are commonly made of rubber, plastic, nylon, aluminum, or stainless steel.
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Castor wheel

Caster