ITEM NAME:Insertable Hitch Lock Trailer Coupling Hitch Lock Tow Ball Caravan For Security- Specifications: Product Name: Trailer Coupling Lock Color: Silver Material: Zinc Alloy Dimensions: 50x65.5mm(Diameter x Heigth) Application: The Ball Lock is an anti-theft locking device that expands & locks inside the coupling of your trailer preventing the trailer from being connected to a Towball. Fit For: All popular trailer couplings Note: -Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. -Please allow a little differs due to manual measurement. Package Included: 1 x Ball Lock 1 x Allen Key 2 x Keys.Application: The Ball Lock is an anti-theft locking device that expands & locks inside the coupling of your trailer preventing the trailer from being connected to a Towball. Fit For: All popular trailer couplings.