Quick Connect Set, Regulator to Hose, Brass, QDB31 QDB32, Fuel Gas Oxygen ORS NASCO Metal free Excellent lubricity Provides outstanding lubrication to Metal free Excellent lubricity Provides outstanding lubrication to all metals including stainless steel Split bite jaw increases grip over standard bite chucks by providing more contact with the bit Superior gripping force provides high mechanical advantage to convert hand tightening torque into superior bit gripping force Hammerlock® mechanism is a positive locking mechanism that prevents loosening in hammer and other high vibration applications Anti lock nut prevents chuck from lock opening Precision operation that meet or exceed stringent din run out and dimensional specifications Brass construction provides long service life Non interchangeable oxygen and fuel gas connectors Instant closure on reverse flow check valves Spring loaded locking mechanism responds to fingertip action and achieves a gas tight connection Double seal socket connection on second seal