The OEM bearing, also known as the flange bearing, is silver, made of metal, and sold individually. It is used on riding mowers to secure the wheel in place and allow it to rotate freely on the shaft. Over time, the part may become worn and damaged, which you will notice if you experience a squealing or grinding sound from the wheel in question, or you notice the wheel is sloppy on the shaft. You will need a hammer and punch to complete this repair, which most of our customers rated as easy. Make sure you tap the new bearing into place evenly inside the tire rim.