Ackwheel Puff Castor Wheel, Thread & Break Size: 2"-Inches (Multi-Colour) 4 Pcs. A-50

A castor wheel is a little undriven wheel that rolls freely (as opposed to powered). They are made to be attached to the underside of a larger object, allowing for simple movement across a floor or other hard surface. Castor wheels are frequently referred to as "castors" on their own.