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 , can grease hard to reach fittings in tight spaces, convenient to connect some difficult fittings, the 3 Jaw coupler design snaps grease fittings easier Material:These coupler are made of quality carbon steel material, the surface is galvanized, which can prevent corrosion to the greatest extent , durable and sturdy, not easy to ,and has a service life. Suitable Suitable 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: 1 set x coupler adapters Only the above package content, other products are not included. Note: Light 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.