Features: 1. Each product has a unique manufacturing part number label on the inner packaging, indicating it has been qualified, including part number, model number, and inspection date information. 2. If you have any questions about the item, please provide the manufacturing part number for verification; your satisfaction will be guaranteed. 3. Single load capacity: 45 kg (99 lbs). 4. Nylon ball roller: Quiet, wear-resistant, non-conductive. 5. Steel shell: High quality, durable, and well-shaped. 6. Dimensions: 24 x 39 mm (0.94 x 1.54 inches) (Diameter x Height); Ball diameter: 15 mm (0.59 inches); Screw thread: M8. 7. Suitable for use in conveyor line installations, home appliances, transmission systems, processing equipment, wooden cases, transfer furniture, workbenches, and similar applications. Specifications: Material: Nylon and Steel Color: Silver Brand: BQLZR Dimensions: 24 x 39 mm (0.94 x 1.54 inches) (Diameter x Height) Ball Diameter: 15 mm (0.59 inches) Screw Thread: M8 Weight: 188 g Package Includes: 4 x Ball Transfer Bearing Casters