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This hitch ball is made specifically to fit Equal-i-zer weight-distribution and sway-control hitches, with the 2-5/16in ball diameter and 1-1/4in shank that those hitch heads are machined for. It's forged from high-strength chromoly steel, not cast, for the strength needed at a 10,000 lb rating.
Made in the USA and sized to match your Equal-i-zer hitch, so fit and strength are a known quantity.