Bulk Hitch Balls with Black Finish from Buyers Products feature a heat-treated black oxide finish that adds an extra degree of corrosion resistance. The 2-5/16 in. balls are rated up to 30,000 lb. They are available in either a 1-1/4 in. or 1-1/2 in. shank diameter and a choice of risers to achieve precise leveling with your trailer.