Fk rsm series rod ends offer 3-piece, extra-strong construction with a heavy-duty shank. They feature a heat-treated alloy steel body thats zinc plated and chromate treated for strength and corrosion resistance. Rsm series rod end balls are made from heat-treated, hard chrome plated 52100 steel. Heat-treated steel alloy races are chromate treated and zinc plated. Rsm series rod ends are available with PTFE liners.