This is a Upper Ball Joint Set (2) made by Lucas for a Triumph TR4A, TR250 and TR6. Lucas felt there was a need for a quality ball joint in the market that resembled the original style ball joint. This ball joint is made with a high quality steel joint with a hardened seat for a long life and a grease zerk is fitted. With the grease zerk you can insure clean grease will always be in the joint which increases the life of the joint. Put a quality product on your Triumph TR4A, TR250 and TR6 with this ball joint with a brand name ball joint.