Add a PTFE liner to the traditional three - piece carbon steel rod end and you have QA1's KM - T Carbon Steel Series rod ends. Available in right and left hand threads and inch dimensions, these truly are precision rod ends. Stud configurations are available. BALL, , 52100 Bearing Steel, Heat Treated, Hard Chrome Plated, Precision Ground, RACE, , Alloy Steel, Corrosion and Wear Resistant, PTFE Lined, BODY, , Carbon Steel (Alloy Steel - Mfr.'s Option), Protective Coated for Corrosion Resistance.