Grease Coupler 3-Jaw, For Use With Grease Guns, Size 1/2 in, Connection 1/8 FNPT, Max. Pressure 10,000 psi, Min. Burst Pressure 10,000 psi, Working Pressure 10,000 psi, Material Steel, Features Steel Jaws and Heat Treated Coupler Body to Withstand High Pressure Without Deformation, Includes Ball Check, Package Quantity 3 WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer, and Di-isodecyl phthalate (DIDP), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Nickel (Metallic)