UPC: 612314167005. 2-5/16" TRAILER BALL (1" X 2-1/8" SHANK, 7,500 LBS., CHROME, PACKAGED) #40067. Fits 2-5/16" couplers and accepts up to 7,500 lbs. 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. 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.