1、Compatibility: Boat trailer axles bearing kit is fit for 5200 to 7000 lbs Trailer Tandem Axles 1.25 to 1.75in D42 Spindle, please confirm whether your model is applicable before buying. 2、Wearproof Material: Made of chrome steel alloy, the bearings are highly resistant to wear and erosion, and can be used in a variety of harsh environments and have a long lifespan. 3、Reduce Hub Friction: New bearing kit provides excellent support for the spindle, reduces the coefficient of friction of the hub, reducing drag between the tractor and trailer, improving driving efficiency. 4、Direct Replace: Designed and manufactured according to the original sizes, can be used to refurbish and replace the old and damaged boat trailer bearings. 5、Package Include: You will receive 4 pcs Inner bearings 25580, 4 pcs Inner races 25520, 4 pcs Outer bearings 14125A, 4 pcs Outer races 14276, 8 pcs Grease seals, 4 pcs Cotter pins, 4pcs Washers.