The rear drum support roller kit includes two drum support rollers, two support shafts, four screws, two spacers, two washers, two retaining rights, and an instruction sheet. If the dryer is making a loud rumbling noise or will not tumble you may need to replace the roller. The drum support roller holds the drum in place while it rotates on the support wheels. Most dryers use two drum rollers, and it is recommended to change both at once. This is a genuine OEM part. Please remember to disconnect the power to the dryer before starting the repair.