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How is the size of Casters counted?


First clear a concept, 3 inch Casters refers to the 3-inch Casters, so you understand!

1 inch is about 2.5cm, so the size of 3 inch Casters is 7.5cm (3*2.5cm);
The size of the 3-inch Casters will involve the model!
The 2.8cm wide Casters are called light casters.
light caster
3.2cm wide Casters is Medium Casters,
The 5cm wide 3" Casters are low Heavy Casters; the wider the wheel, the heavier the load.
Heavy Casters