R4AZZ Small Ball Bearing (I.D.=1/4", O.D.=3/4", Thickness=9/32") R4A-2Z bearings are shielded on BOTH SIDES to keep lubricant in Chromium Steel long-life bearings, smooth and low noise Static load rating of 615 newtons and dynamic load rating of 1480 newtons Used for the pivot on a baby's cradle,band saw blade guide,blower motor of natural gas fireplace,replace the bushings in zebco 33 reel Ball bearing, in which the rolling elements are spherical balls. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. (Reducing the friction of certain moving parts by replacing sliding friction with rolling friction) With small friction and high-limit speed, cost-effective and require little maintenance