Core made of High-Carbon AISI 52100 Chromium Alloy Steel features higher wear resistance, fatigue strength and steel hardness, Premium quality MolyPro™ NLGI Grade 2 Molybdenum Grease (MoS2) to minimize wear and reduce friction providing longer lasting performance, Exclusive multi-lip seals are made with ProSeal™ Nitrile Rubber (NBR) which can successfully function at high delta of temperatures while retaining its flexibility and sealing performance, Inner rings are made of Case-Hardened Steel for improved resistance to surface wear and contact fatigue, Thickness and metallurgy electronically validated for manufacturing consistency, SAE J1714, J2525 and J2535 validated for OEM load-carrying capacity, durability, and performance characteristics, Bearing already mounted and secured on the assembly to required OE torque specification for easier and faster installation, Coated wheel studs resist corrosion and rust for easier removal and proper torquing, Professional-Grade ABS sensors and clips with AccuPro™ technology included (when required by the application), Part Reference Numbers : 1411-605375 WE61808 94-605375 S515195 NT515195 WH515169 MB40325 515195 BR931007 HA590594 555103 TRB-515169 515169