Are you looking for a professional, yet affordable roller ball transfer bearing? Are you in search of a sturdy, trustworthy tool that can do multiple works at once? If yes, look no further Our professional roller ball transfer bearing must meet you needs. It is one of the best choices for you.Features- Color: Silver.- Material: Steel.- Size: About 4.80X3.20X2.00cm/1.89X1.26X0.79inch.- Smooth and silent moving, good load-bearing.- With practical but simple design, wear resistant and shockproof.- Made of premium material, with long service life and better performance.- This ball transfer units are used for transporting flat, smooth objects such as trays.- Featuring two screw holes in each bearing surround for solid attachment to the worktable or workbench.Packing list: 20 x wheels