... specifications:1.Load capacity: 35KG per caster 2.Wheel diameter:50mm3.Caster material: Nylon,pressed steel,zinc plated4. ... international quality standard: ISO 9001:20082.Company: Flywheel Caster Manufacturing Ltd., established in 1981, which is located in ... corrosion-resistance.Now it already has become a professional caster company which integrates design, manufacture, assemble, inspection and ...