Spring loaded: spring loaded sleeve 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. Designed: Grease coupler is designed with 90 degree, can grease hard to reach fittings in tight spaces, convenient to connect some difficult fittings, the 3 Jaw coupler design snaps on and off grease fittings easier Material:These 90 degree crease coupler are made of quality carbon steel material, the is galvanized, which can prevent to the greatest extent , and sturdy, not easy to break,and has a longer service life. For use with most hand-operated grease Connects to standard grease couplers,compatible with flex hose or rigid pipe Maximum operating pressure of 4, 500 PSI Colour: Silver Material: Carbon Steel Package Contents: 3 set x coupler adapters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.