The PINLESS HD Clamp features an integrated clasp mechanism with a safety lock push-button, replacing the old quick release pin. This new clasp mechanism is very easy to use and delivers a significantly more secure connection, while the safety lock, which is always set in the locked position, provides an extra level of security to ensure the clamp never pops open unintentionally. You get a more robust connection but you never again need to worry about a pin getting lost or malfunctioning due to debris buildup. The PINLESS HD Clamp provides the installer with positive feedback and an audible click when properly closed. • The PINLESS HD Clamp also features a new, integrated hinge spring to ensure the clamp always remains in a sprung closed position, which makes installation easier as the clamp will naturally align itself onto the union sleeve. • The PINLESS HD Clamp is completely backwards compatible with all original HD Clamp systems, upgrading is quick and easy. • Precision CNC machined from 6061 billet aluminum, are available in sizes ranging from 2" to 5" O.D.