6" Ring Coupler - Snow Groomers: Nordic, Snowmobile, Fat Bike, Snowshoeing, Winter Sports
Amazon.com: CURT 48560 Black Steel Pintle Hitch Lunette Ring 3-Inch ID, 60,000 lbs, 4-1/2-Inch Bolt Pattern : Automotive
Military Trailer Pintle Hitch / Lunette Ring - Oshkosh Equipment
Amazon.co.jp: KftRocks D-Ring Shackle Hitch Receiver 2" Tow Hook 3/4" D-Ring Shackle Trailer Hitch with Locking Pin & Clip for 50.8mm (2") Hitch Angle 35000lbs Car Tow Hook Tow Ring Universal Rust
Amazon.com: CURT 48660 Raw Steel Pintle Hitch Lunette Ring 3-Inch ID, 24,000 lbs, Channel Mount Required : Automotive