... Product specifications:1.Load capacity: 35KG per caster 2.Wheel diameter:50mm3.Caster material: Nylon,pressed steel,zinc plated4.Chrome ... corrosion-resistance.Now it already has become a professional caster company which integrates design, manufacture, assemble, inspection ... usage, such as, for industrial machine, medical facility, furniture, trolley, shopping cart, forklift, scaffold, shelf, etc. ...