WHOLESALE 3" x 5/16" SQUARE PTO PIN Use for a Wide Range of Farm, Lawn, and Garden Applications. Tempered for Spring Action. Durable High Quality Steel Construction. Zinc Plated to Resist Rust. Securely Attaches to Trailer Assemblies and Couplers. ⚠ WARNING: This product can expose you to LEAD, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.