2-5/16" Trailer Ball (1" x 2-1/4" Shank, 10,000 lbs., Chrome) #40007
Fits 2-5/16" couplers and accepts up to 10,000 lbs. GTW
Constructed from high-strength, hot-forged steel
Protected by a durable chrome-plated finish
Zinc-plated hex nut and helical lock washer for secure mounting
Features fine threads for superior holding strength
Tested for safety to meet U.S. VESC V-5 specifications
Limited 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