Hello, I replace the parts state (website www.lingjianbang.com) to make the answer:
In terms of manufacturers in our contact, the simplest is divided into: small light casters, light casters, medium-sized casters, heavy casters, super-heavy-duty casters, other casters. Subdivided by its function: directional, universal, flat top, screw, rod, hole top, single brake, double brake, side brake and so on.
For example: heavy-duty double-brake universal casters, medium-sized flat-top directional casters
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