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This 2-1/2 x 1-3/4 Glass-Filled Nylon Swivel Caster offers the same weight capacity as a steel wheel but is dramatically lighter and won’t rust. They have an operating temperature of -45° to +350° Fahrenheit. Glass filled nylon wheels have good abrasion and compression resistance and they won’t flat spot.
For more info, check out Caster Wheel Types.