FK Bearing's 3 piece HRSMX series heim joints with a built in misalignment shoulder. Heat treated hard chrome plated 52100 steel ball. Heat treated 4340 chromoly Zinc plated chromate treated body. Alloy steel Zinc plated chromate treated race. PTFE fabric liner.

The difference between the HRSMX and HJMX series, is that the HRSMX has a larger diameter shank than its hole. The HJMX series shank diameter is the same size as its hole diameter. For example the HJMX7T has a 7/16" shank and a 7/16" hole.