This Trimax Locks barbell Trailer Hitch Pin has a 5/8 inch diameter and is sold individually. Specifications•Compatibility: Class III/ IV/ V Hitch•Includes Key Lock: Yes•Diameter (IN):5/8 Inch•Type: Barbell•Length (IN):2-3/4 Inch•Finish: Chrome Plated•Material: Steel•Includes Clip: No•Includes Dust Cover: Yes•Quantity: Single 2-3/4 Inch Span Use With Class III Thru Class V Hitches Chrome Plated Steel | Locks Barbell Trailer Hitch Pin, 5/8" x 2-3/4" Span