1. From the packaging look

Generally formalCastersThe factory is made of cardboard or trayCastersFor packaging and shipping, marked with a clear inclusionCastersOf product name, manufacturer's address, telephone, etc., effective preventionCastersDamage caused by transportation. And small factories because there is no mass production or in order to save costs, usually using woven bags, can not ensure thatCastersThe product is not damaged during transport.

2 fromCastersWheel appearance

CastersIs used for moving, whether it is injection molding of plastic round, or processing of metalCastersWheel, allCastersThe wheels must be round or spherical, which is the most basic.CastersOf the wheels, the surface is smooth, no bruises, color uniform, no obvious color.

FromCastersWork performance

High quality caster, in the roof rotation, each ball should be able to and steel runway surface contact, smooth rotation, no obvious resistance phenomenon.CastersThe wheels in the rotation, it should be flexible rotation, no obvious jump up and down

FromCastersTread hardness check

The use of hardness on the surface of the wheel hardness testing to see whether the surface hardness of the wheel is not a small error, whether the product hardness range.

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