Zinc Coupler Safety PinSpring locking action secures the coupler clip and prevents accidental uncoupling.Zinc plated steel1/4″ pin shank fits all couplers1-3/4″ usable length1-1/2″ clearance under spring armCoupler not included.WARNING: This product can expose you to chemicals including ARSENIC ,CADMIUM which are known to the State of California to cause cancer or other reproductive harm, and BERYLLIUM,COBALT METAL POWDER,NICKEL (METALLIC) which are known to the State of California to cause cancer, and Chromium (hexavalent compounds),LEAD which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.