Ball size: 2 inch | Inside width: 3 inch | Maximum gross trailer weight: 6,000 pounds | Husky straight coupler includes a safety pin as an additional means of securing the ball clamp in a locked position (safety pin is required to be used at all times) and a safety chain to eliminate loss of the safety pin | The quick release assembly allows for fast and safe locking and unlocking of the ball clamp for convenient hook-up and disconnect