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. Ball transfer unit can also be used in a of non-industrial applications, including retail store displays and airport luggage transfers. 4. Ball support cup is hardened and plated, protective cover assures low torque and . 5. Ball Transfer Unit is perfect replacement for your broken one on your office chair. 6. APPLICATION: Widely used in transmission system, feeding system, processing system, processing machinery. Specifications: Product Name: Ball Transfer Bearing Surface treatment : Zinc Plating Length : 72.5mm Height : 30mm Mounting Hole Pitch : 55mm Fixing Hole Distance : 5.5mm Ball Diameter : 25.4mm (1 inch) FEATURES: 360 universal transfer bearings. Single Load : 25Kg/55lbs (Max. 30kg/66lbs) Colour:Silver Material:Carbon steel Package Contents: 5 * Ball Transfer Bearing Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.