LANIAKEA 16 Pack 5/8 Inch Universal Transfer Bearings Rollers - 360 Degree Rotation Well Made Premium Material Durable and Practical Use SPECIFICATIONS: Model: CY-15A Material: Carbon Steel + Steel Ball Capacity(Max.): 15kg/33.07lb Ball Diameter: 5/8 in Dimension: 50mmx20mm (Flange Length Height) Mount Hole Dia.: 4mm/0.16 USING HINT: Be sure to add lubricating oil before using the universal ball There will be a little noises when moved on hard floor. The ball flange is 1.5 in length so the furniture feet needs to be 1.5 square or 1.5 in diameter to stay hidden. Roller transfer bearings, they can combine a few together to add more weight. WIDE APPLICATIONS: These roller ball bearings are easy to install on most light furniture. e.g. mounted on the bottom of a shelf, dining room chairs, small service table, cabinet, drawer boxes, desk, A/V console, under bed drawers, storage baskets and table saw, miter saw . Other DIY Use: using these ball transfer bearings as part of a custom bowling ball spinner, and the quality can be felt and heard with these. Package Included: 16 PCS 360 Degree Rotation 5/8 Inch Roller Ball Bearing Casters