LOCK AND SEAL - Grease gun coupler jaw design allows for easy opening and closing of grease fittings. Reinforced jaws and high-quality sealing gaskets ensure durable, 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. Provides stable and reliable operation. One-Handed Operation - Double handle anti-slip design and smooth retract mechanism enable one-handed use for easy installation and removal. Once attached to the grease fitting, it remains open, freeing both hands to operate the grease gun. WIDE APPLICATIONS - Compatible with 14mm standard fittings and works with micro, battery-powered, pneumatic, and manual grease guns. Fits M6, M8, M10, M12, and M14 grease fittings. Easily replaces existing grease gun couplers. Material: Iron Color: Chrome Package Contents: 1 x Grease Nipple Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement may vary by +/- 1-3 cm.