LOCK AND SEAL - Grease coupler jaw design ensures easy opening and secure connection to the grease fitting. Reinforced jaws and high-quality sealing gaskets provide long-lasting, stable performance with no leaks, even under extreme pressure up to 17,000 PSI. High Quality - Constructed from premium refined iron, suitable for all-weather indoor and outdoor use, offering durability and stability. One-Handed Operation - Double handle anti-slip design and retractable mechanism allow for convenient one-handed operation. Easily install or remove. Once locked onto the grease fitting, it stays open, freeing both hands for grease gun operation. WIDE APPLICATIONS - Compatible with 14mm standard fittings and works with battery, pneumatic, and manual grease guns. Fits M6, M8, M10, M12, and M14 grease fittings. Simply replace your existing grease coupler for immediate use. Material: Iron Color: Chrome Package Contents: 1 x Grease Nipple Note: Light reflection and different display settings may cause slight color variation between the image and the actual item. Measurement may vary by +/- 1-3 cm.