Heavy Duty Casted Steel Adjustable Coupler. Using a 2 5/16 inch Ball, this trailer coupler is rated for 14,000 pounds of towing capacity. Mounts using (2) 5/8 in x 4 1/4 in Bolts which are included with the ordering of this product. Device uses Auto Locking Leave Lock to secure itself to the Ball. MADE IN THE USA and has a 5 year Manufacturers Warranty