Receiver Lock 5/8" for 3" Square Class V Receivers Sleeved to 3/4&'; Dogbone StyleThe Draw Tite 5/8 In. diameter dogbone lock is primarily designed for towing for securing class V towing ball mounts that have a 3 In. sized receiver tube.Features: For use with 3 In. square shanks Class V Bright zinc finish 4 In. span Traditional flat key Always write down your key number Sleeve to 3/4 inch WARNING: This product can expose you to chemicals including Chromium (hexavalent compounds) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.