Standard and heavy-duty towing for lunette rings or towing bars. Spring loaded locking with safety pin and chain. Ball size = 2". 3,000 lbs. Max Vertical Load. 16,000 lbs. Max Gross Trailer. hole centers 3 3/8" left to right, 1 3/4" top to bottom. Installs with four 1/2" bolts (Not included). Wt. 13 lbs.