Description The CURT 2 5/16" trailer ball does not mess around. Simply put, it is a solid piece of towing equipment that makes all others look like they're just spinning their wheels. CURT 2 5/16" trailer balls are made with expert engineering to be packed with strength and durable enough to withstand the harsh wear of heavy-duty towing. Anything your class 5 trailer hitch and class 5 ball mount can handle, CURT has a 2 5/16" trailer ball to match. These tow balls are perfect for towing all types of heavy receiver-style trailers, including dump trailers, toy haulers, farm trailers, chopper boxes, dual-axle utility trailers, deluxe RVs, small yachts and more (NOTE: Never exceed the lowest weight capacity of any towing component; i.e. the vehicle, hitch, trailer, etc).This 2 5/16" trailer ball features a ball capacity of 25,000 lbs. It features a 1 1/4" shank diameter, a 2 5/8" shank length, 1" of rise and a raw steel finish to protect against the elements. To give you the power you need to tow with confidence, CURT 2 5/16" trailer hitch balls are thoroughly tested for safety and meet U.S. VESC specifications.Fits 2 5/16" couplers and accepts up to 25,000 lbs. GTW1" shank rise for precise trailer levelingConstructed from high-strength raw steelHeat-treated for optimum wear resistanceZinc-plated hex nut and helical lock washer for secure mountingFeatures fine threads for superior holding strengthTested for safety to meet U.S. VESC V-19 specificationsLimited lifetime warranty (one-year finish, one-year parts)Notes:The mounting platform must be at least 3/8" thick, and the hole size must not be more than 1/16" larger in diameter than the threaded shank.