Features： 1、Stainless Steel Material: Constructed with high grade stainless steel, the caps are wear resistant, scratch resistant, and has high strength for long lasting durability. 2、Auto Check Grease Level: With the auto check feature, you can observe the grease level anytime and keep contaminants out, ensuring maximum performance. 3、Enhanced Performance: This bearing protectors ensures water out and grease in, saving you from serious mechanical problems and providing a comfortable performance. 4、Easy Installation Design: The bearing caps are easy to install on your wheel, offering special protection for your bearings with high shields on both sides. 5、Strong Compatibility: The protector caps are designed for boat trailers with a diameter of 2.717 inches, offering a dependable solution for wheel maintenance. Specification： Item Type: Boat Trailer Bearing Protector Material: Stainless Steel + Aluminum Alloy Size: 2.717in diameter Fitment: for Boat Trailer Package List： 2 x Bearing Protectors