Specifications:Type: Bolt-fixingMaterial(Bearing Ball):Load Capacity(Max.): kg / lbBall Diameter: mm / InchMounting Hole Dia.: mm / InchOverall Size: (DxH)Features:1. Ball Transfer Unit is omni-directional load-bearing spherical balls mounted inside a restraining fixture2. 360 universal transfer bearing ball is good for facilitating smooth, multi-directional motion3. Widely used in various transmission systems, feed systems, processing systems, packaging machinery auxiliary equipment, as well as object turning and confluence. Note: 1. Use for transporting stuff has a smooth or flat bottom2. If to transport something that has an uneven or soft bottom surface, the tray could help you3. This ball transfer unit is not used as a swivel caster to move on the floorPackage Content: x Ball Transfer Unit