Protect your trailer and wheel hubs with our lube-applying trailer hub cover, serving as both boat trailer hub covers and trailer bearing caps. Designed for 1.98" wheel hubs, these covers offer easy installation by filling them with bearing grease and covering them with the included axle dust cap covers. With two boat trailer bearings and two 1.98 trailer bearing caps included, constant lubrication is easily maintained using a standard zerk fitting mini grease gun. Crafted from marine-grade carbon steel with a chrome coating, our trailer hub grease caps ensure durability in harsh conditions, including saltwater exposure. Better Boat Products, a family-owned American business, guarantees premium quality and exceptional customer service, standing behind the durability and performance of our boat trailer bearing caps.