A push button pin for coupling together two halves of pliers. The pin can include one or more balls elastically biased in a radially-outward direction to couple the pin to a retainer. The balls are normally pushed outward by an engagement portion, but a push button head can be pressed axially downward and cause the balls to align with a receiving portion, which allows the balls to descend into the interior of the pin. The push button is also integral with the receiving and engagement portions to better facilitate the movement of the balls and the removability of the pin. A user can therefore quickly adjust the jaw width of a pair of pliers and better utilize the pliers in the process.