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 BearingSurface treatment : Zinc PlatingLength : 72.5mmHeight : 30mmMounting Hole Pitch : 55mmFixing Hole Distance : 5.5mmBall Diameter : 25.4mm (1 inch)FEATURES: 360 universal transfer bearings.Single Load : 25Kg/55lbs (Max. 30kg/66lbs)Colour:SilverMaterial:Carbon steelPackage Contents:5 * Ball Transfer BearingOnly 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.