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:*Model: CY-15A*Capacity(Max.): 10kg/22lb*Ball Diameter: 15.8mm / 0.62-inch*Mount Hole Dia.: 4mm/0.16-inch*Mount Hole Distance: 39mm/1.5-inch*Material: Carbon Steel, Nylon*Dimension: 48 x 32 x 20mm/1.9-inch x 1.26-inch x 0.8-inch(L*W*H)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.