CURT trailer balls are engineered to the highest quality & specifications for fit, performance and endurance, with a quality finish and fine threads for more holding strength. They all meet the U.S.
V5 specifications and are tested for your safety.

Many elements determine the correct trailer ball; platform thickness, hole size, coupler size, and weight rating. The platform must be at least 3/8 In. thick and the hole size must not be more than 1/16 of an inch larger in diameter than the threaded shank.