1.ball dia: 50mm,1-7/8", 2", 2-5/16", 2. ... : chrome, zinc, powder coating, polished, etc 3.marking: customer decide hitch ball BALL DIA50mm, 1-7/8", 2", 2-5/16"SHANK DIA3 ... , pls send us your details, including pictures, spec., drawings, etc. ISO standard hitch ball