Fits 40 to 50mm towing eyes, commonly used on plant equipment like compressors, water bowsers etc. Approved to Sold Secure Gold standard for trailers. Approved by Secured by Design. Fitment in under 10 seconds. Unique high security patented locking system. Water and corrosion proof. Body is one piece steel construction. High security pick-free locks have thousands of possible key combinations and are supplied with 3 keys, plus a key identity tag. Registered design no. UK 9 000 653 241 0001. Registered design no. Europe 000 653 2410001. The box contains; 40mm/50mm towing eye cover, Locking bolt body, Locking bolt lockholder with three keys, Fitting instructions and warranty card.