This kit includes two trailer axle grease seals and two stainless steel wear sleeves designed for use with UFP Vault systems. These components are commonly used on boat trailers and other applications requiring a durable sealing surface. The double lip seal design provides improved retention, while the stainless wear sleeve offers a consistent sealing surface on worn spindles. Compatible with UFP axles and similar setups using the same seal dimensions. Grease seals retain lubrication inside the hub while preventing water and debris from entering. In marine applications, wear grooves can form on the spindle where the seal rides. Stainless wear sleeves restore this surface, allowing proper sealing. Confirm spindle size and seal dimensions before installation. IMPORTANT: Verify specifications before installation. Consult owners manual for proper part number identification and proper installation. Please refer to list for compatibility.