R4-2RS ZrO2/Si3n4 Full Ceramic Bearing SRL GreaseR4 2RS ZrO2 Si3n4 SRL Ball Bearing 1 4"x 5 8"x 0. 196" inch R4 2RS ZrO2 Si3n4 Bearing, measures an inner diameter of 1 4", outer diameter is 5 8" and the width is 0. 196", a standard bearing size commonly used in a variety of industrial and commercial applications, Bearing is made from Ceramic. The all bearing grease is recognized as "standard" throughout the world. Exceptionally good low noise profile and long life grease usable over wide temperature