UPC: 612314000067. 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 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