Spring loaded: Spring loaded sleeve locks coupler in place, ensuring a secure connection between your straight coupler and this coupler, helping prevent leakage and making grease filling more efficient and convenient. Designed for hard-to-reach fittings: Grease coupler is designed to access tight spaces, allowing easy connection to difficult fittings; the 360-degree swivel design simplifies grease fitting applications. Material: Made of high-quality carbon steel with a galvanized surface finish for maximum corrosion resistance, durable, sturdy, and built to last. Compatible with most hand-operated grease guns. Connects to standard grease couplers and works 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: Light and display differences may cause slight color variation between the image and actual item. Measurement may vary by +/- 1-3 cm.