These are ball casters, they can swivel 360-degrees. Suitable for processing machinery, furniture, machinery, toys, etc. Smooth moving and wear resistant, can be used for a long time. Quiet and strong load-bearing, very practical. Features -Color:Silver -Material:Carbon Steel -Size:1.00X1.00X1.00cm/0.39X0.39X0.39in - Made of high-class materials, and sturdy. Strong load-bearing, stable and safe. - Ball transfer is suitable for electronics, hardware, machinery, chemical, food, forest, books, supermarkets, rubber and other industries. - Used in transmission system, feeding system, processing system, processing machinery and packaging machinery auxiliary equipment. - Moreover, it works perfectly for drawer, so that you can roll it out with minimal pull. - Flexible, high-speeds and stable operation,used for rotating and changing the direction of the cargo. Package list: 8 Bearing Rollers