Ball Transfer Units CY-15A Flange Mounted 5/8-inch Roller Ball Transfer Bearing Casters 22lb Load Capacity. Featuring two screw holes in each bearing surround for solid attachment to the worktable or workbench. With a load bearing of 55Lbs each, they are supplied in a set of 16. Features 1.Ball Transfer Unit are omni-directional load-bearing spherical balls mounted inside a restraining fixture. 2.360 universal transfer bearings is suitable for curved work created on band saws and router tables. 3. 5/8 inch diameter ball bearing roller is perfect. With a load bearing capacity of 22 lbs each. 4.Housing be made of carbon steel material, Roller Ball made from Nylon. 5.Featues: Two screw holes in each bearing surround for solid attachment to the worktable or workbench. 6.Widely used in transmission system, feeding system, processing system, processing machinery and packaging machinery auxiliary equipment. Specifications: Material: Carbon Steel, Nylon Model: CY-15A Capacity(Max.): 10kg/22lb Ball Diameter: 15.8mm / 0.62-inch Mount Hole Dia: 4mm/0.16-inch Mount Hole Distance: 4mm/0.16-inch Dimension: 50 x 21 x 15.8mm/2 inch x 0.8 inch x 0.6 inch Package Included: 16 x Ball Transfer Unit Note: These Ball Transfer Units are used for transporting flat, smooth objects such as trays. It is not suitable for transporting stuff which has uneven or soft bottom surface such as cloth wrapping. It can not be used as swivel caster to move on the floor.