VEVOR 4 Pack 6 x 2 Inch Caster Wheels 2 Rigid and 2 Swivel Casters with Side Brake Polyurethane Iron Core Plate 1000LBS Capacity Per Wheel

The ability to withstand wear, pressure, or damage over time The capacity to adjust to new conditions or to be modified for a new purpose or environment The quality of achieving maximum productivity with minimum wasted effort or resources.