Spring loaded: The spring-loaded sleeve locks the coupler in place, helping to secure the connection between your straight coupler and this angle coupler, preventing leakage and making grease filling more efficient and convenient. Designed: The grease coupler features a 90-degree design, allowing access to hard-to-reach fittings in tight spaces. The 3-jaw coupler design snaps on and off grease fittings easily. Material: These 90-degree grease couplers are made of quality carbon steel with a galvanized surface to help prevent corrosion, ensuring durability, strength, and a long service life. Compatible with most hand-operated grease guns. Connects to standard grease couplers and is compatible with flex hose or rigid pipe. Maximum operating pressure: 4,500 PSI. Color: Silver Material: Carbon Steel Package Contents: 1 set x coupler adapters Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by +/- 1-3 cm.