U-Joints are cold forged from SCM-415 steel, precision ground journals are case hardened to HRC58-61 Pre-greased with hi-temp Lithium Complex 3 grease, zerk and grease channels in bearing cup evenly distribute grease Kits include cap plug to eliminate grease zerk for low clearance applications Honda yoke assemblies have upgraded cross diameters from 17mm to 19mm and feature stainless steel clamps and hi-quality neoprene rubber boots for long life and abrasion resistance. U-JOINT KIT 19-1011