The CURT QuickPin Trailer Coupler uses a single hitch pin to secure the coupler onto the ball. The simple pin design provides a secure vehicle-trailer connection while reducing stress, frustration, and the time it takes to hook up a trailer, the company says. The QuickPin coupler is currently available to fit standard 2” diameter balls, and offered in three different trailer tongue widths: 2”, 2-1/2”, and 3”. The QuickPin comes with pre-drilled holes to fit most existing bolt configurations, making installation easy.