Specifications: Premium Polychloroprene Sealed Boot w/ Grease-Relief Valve:Stands up to environmental extremes and allows contaminants to be flushed Powdered-Metal Gusher Bearing Technology:Provides strength and stability and allows grease to flow through bearing surface for reduced friction and long life Full-Ball Hardened Stud w/ Grease Grooves: Promotes longer life and smooth articulation One-piece Forged Housing:Provides durability and strength Belleville Washer Pre-Load:Ensures tight tolerances Greaseable Design:MOOG® ball joints are designed to make lubrication service easier, contributing to longer component life Pressed-in Patented Cover Plate DesignCompressed into place, its placement within the housing virtually eliminates excess axial and radial movement of the full-ball stud, securing a solid steering feel for the life of the part What's Included: (1) upper ball joint