MegaHitch Lock Coupler Vault Pro with 2 5/16" ball (Rock Gray) Universal Coupler Vault Pro Hitch Lock for Standard Units Interchangeable Security System for 2" and 2 5/16" Hitch Ball Adjustable High Density Acetate Ball Provides Stronger Security New Cam Lock Security Mechanism Strategically Placed Out of Sight on Undercarriage Available in Rock Gray and Red