Tusk U-joints are a direct OE replacement for your UTV or ATV. Made from cold-forged SCM-415 steel with precision machined bearings hardened to HRC58-61, ensuring durability and a precise fit. Tusk U-joints are pre-greased with high-temperature Lithium Complex 3 grease and feature a grease zerk to keep the U-joint easily and evenly greased. The bearing cups feature a 4-lip seal to keep grease in and dirt and water out.