Black 3 Inch Medical Casters Special Casters for Hospital Equipment and Instruments. Custom Thread Stem: Thread stem size M10*50mm is available for customization. OEM/ODM Service: We support OEM and ODM services for custom branding and design. High Load Capacity: Maximum load capacity of 60kg per caster wheel. Durable Materials: Constructed with Nylon and TPR wheels for durability. Professional Manufacturer: Factory specializing in caster wheels since 2014. Strict Quality Control: 100% inspection before packing and random checks after. Flexible MOQ: Orders as small as 5pcs per SKU are accepted. Fast Delivery: General delivery time within 20 days depending on quantity.