UC202 15mm Black Oxide Plated Axle Bearing Insert Mounted BearingUC202 Black Oxide Plated Mounted Bearing Insert 15mm x 47mm x 31mm 15mm Black Oxide Plated mounted Bearing UC202, measures an inner diameter of 15mm, the outer diameter is 47mm, the inner ring width is 31mm and the outer ring width is 16mm. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. UC202 Bearing Mounted Bearing Bearing Size: 15mm x