Hudson Bearings flying saucer ball transfer. Made of carbon steel. Can be recessed into the surface of the application forming a smooth, multi-directional rolling surface. Precision-formed steel housing. Integral mounting holes for ease of installation. Ball transfers solve a variety of material handling and motion control challenges, whether used in the traditional 'ball up' position or as a caster in the 'ball down' orientation. Ball transfers offer advantages to traditional casters, such as lower profiles and omnidirectional movement, often at a lower cost. Common applications: air cargo, shears, robotics, military logistics, store fixtures, die handling, laser and plasma cutters, glass and metal manufacturing, medical devices, caster substitution. 20 pounds load capacity. 5/8-inches diameter.