Package contents: you will receive 2 pieces silver coupler adapters that will satisfy your various needs, effective locking and quick release mechanisms ensure that grease enters the machine without spilling or leaking, safe and convenient to use in your daily life Spring loaded design: spring loaded locks coupler in place, helps to secure the connection between your straight coupler and this angle coupler and preventing leakage, make the grease filling more efficient and convenient Reliable material: made of quality carbon steel material, these 90 degree crease couplers are sturdy and durable, the surface is galvanized, which can prevent corrosion to the largest extent and has a longer service life, durable and sturdy, not easy to break, can be applied for long term Easy to operate: designed with 90 degree, this grease coupler can grease hard to reach zerk fittings in tight spaces, convenient for you to connect some difficult fittings, the 3 jaw coupler design snaps on and off grease fittings easier Multiple function: the 90 degree crease coupler can be applied for auto, farm, truck or industrial using, good for hard-to-reach grease fittings on cars, trucks, farm equipment and more, it can be also suitable for most hand-operated grease tools, with working pressure range for 3000-4500PSI