Connor Towing 1626230- Bolt-On Pintle Hook with 2-5/16 Ball: GTW-16000 lbs. Ball diameter: 2-5/16"; Ball hole diameter: 1-1/8" Ball GTW capacity: 12,000 lbs Fits 2-1/2" and 3" lunette rings Mounting holes: 3-3/8" wide from hole to hole; 1-3/4" high from hole to hole Hole diameter: 17/32"