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*Avoid upper bearing design of ground installation* The rubber wheel is made of high-quality engineering materials by injection molding, which has the advantages of smoothness, silence and so on* The insert sleeve is made of metal aluminum profile, which has the advantages of more stable size and better load-bearing effect * the bearing adopts high-quality and high-precision deep groove spherical bearing* The lifting wheel has a single oil cylinder, which can realize the two-way buffer function* The subject surface treatment is oxidized sub black, and the salt spray test can reach more than 120h* It is suitable for residence, hotel, office building, hospital, office and other places.